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index 68cf5ff6b5ceccdb3a4e8a90a24b55ca24f60c0a..407daa82692e56528a5379382c906f2b20b856e6 100644
--- a/sphinx/build/html/V2_00.html
+++ b/sphinx/build/html/V2_00.html
@@ -33,7 +33,6 @@
<script src="_static/jquery.js"></script>
<script src="_static/underscore.js"></script>
<script src="_static/doctools.js"></script>
- <script async="async" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
<script type="text/javascript" src="_static/js/theme.js"></script>
@@ -98,25 +97,10 @@
<li class="toctree-l3"><a class="reference internal" href="#activate-virtual-environnement-on-thonny-python-ide-on-rapberry-pi">Activate virtual environnement on Thonny (Python IDE) (on Rapberry Pi)</a></li>
</ul>
</li>
-<li class="toctree-l2"><a class="reference internal" href="#assembly-of-the-measuring-current-injection-cards-and-connection-with-the-raspberry-pi">Assembly of the measuring/current injection cards, and connection with the Raspberry Pi</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#electrical-resistivity-measurements-board">Electrical resistivity measurements board</a><ul>
-<li class="toctree-l4"><a class="reference internal" href="#a-description">a) Description</a></li>
-<li class="toctree-l4"><a class="reference internal" href="#b-implementation">b) Implementation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#step-n2-assembly-of-the-measurement-board"><strong>STEP n°2</strong>: Assembly of the measurement board</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#description">Description</a></li>
</ul>
</li>
-<li class="toctree-l3"><a class="reference internal" href="#current-injection-board">Current injection board</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#frist-four-electrodes-resistivity-mesurement">Frist four electrodes resistivity mesurement</a></li>
-</ul>
-</li>
-<li class="toctree-l2"><a class="reference internal" href="#multiplexer-implentation">Multiplexer implentation</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#electrode-connection">Electrode connection</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#operating-instruction">Operating instruction</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#preliminary-procedure-only-for-the-initial-operation">Preliminary procedure (Only for the initial operation)</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#startup-procedure">Startup procedure</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#electrical-resistivity-measurement-parameters-description">Electrical resistivity measurement parameters description</a></li>
-</ul>
-</li>
-<li class="toctree-l2"><a class="reference internal" href="#complete-list-of-components">Complete list of components</a></li>
</ul>
</li>
</ul>
@@ -439,486 +423,103 @@ to leave the virtual environment simply type:</p>
<p>9- Close thonny to save modifications</p>
</section>
</section>
-<section id="assembly-of-the-measuring-current-injection-cards-and-connection-with-the-raspberry-pi">
-<h2>Assembly of the measuring/current injection cards, and connection with the Raspberry Pi<a class="headerlink" href="#assembly-of-the-measuring-current-injection-cards-and-connection-with-the-raspberry-pi" title="Permalink to this headline">¶</a></h2>
-<section id="electrical-resistivity-measurements-board">
-<h3>Electrical resistivity measurements board<a class="headerlink" href="#electrical-resistivity-measurements-board" title="Permalink to this headline">¶</a></h3>
-<section id="a-description">
-<h4>a) Description<a class="headerlink" href="#a-description" title="Permalink to this headline">¶</a></h4>
-<p>To measure electrical resistivity with Raspberry Pi, an ADS1115 was introduced, as proposed by Florsch [7]. The ADS1115
-is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. Its value has been set at 2/3 in this study. The
-input signal value could lie between - to + 6.114 V. The ADS1115 is mounted on a board adapted from an in-house design.
-Figure 5 shows the general diagram for the electronic measurement board developed. This figure also displays the test
-circuit used to test the board in the laboratory, which mimics the behavior of a soil subjected to current injection.
-In this test circuit, resistance R11 represents the soil resistance.
-Soil resistance R11 is connected to electrodes A and B for the current injection. Resistors R10 and R12 constitute
-the contact resistances between soil and electrodes; they are typically made of stainless steel. The battery, which
-allows for direct current injection, is connected in series with resistors R10, R11 and R12. In this part of the board,
-resistance R9 has been added to measure the current flowing between electrodes A and B. This resistance value has been
-set at 50 ohms in order to ensure:
-• a precise resistance,
-• a resistance less than the sum of resistors R10, R11 and R12; indeed, R10 and R12 generally lie between 100 and 5,000 ohms.
-To measure the current intensity between A and B, the electrical potential difference at the pole of the reference resistor (R9)
-is measured. The intensity (in mA) is calculated by inserting the resulting value into the following: ?
-To measure the potential difference needed to measure current intensity, the ADS 1115 is connected to the ground of the circuit.
-In our case, the ground reference is electrode B. The analog inputs A1 and A0 of the ADS1115 are connected to each pole of the
-reference resistor (R9). In order to increase input impedance and adapt the signal gain, tracking amplifiers have been included
-and completed by a divider bridge (R5, R8, R6 and R7) located between the two amplifiers. The resistance of the divider bridge
-ensures that the signal remains between 0 and 5 V, in accordance with the ADS1115 signal gain. To measure the potential difference,
-the M and N electrodes are connected to analog inputs A2 and A3 of the ADS 1115. Between the ADC and the electrodes, two tracking
-amplifiers and a divider bridge have been positioned so as to obtain a potential lying within the 0-5 V range at the analog input of the ADS 1115.
-Let’s note that the potential difference value would equal the potential measured with ADS1115 multiplied by the voltage reduction
-value of the divider bridge (see Section 5.2). Despite the use of high-resolution resistance (i.e. accurate to within 1%), it is
-still necessary to calibrate the divider bridge using a precision voltmeter. For this purpose, the input and output potentials
-of the divider bridge must be measured using an equivalent circuit for various electrical potential values. These values serve
-to calculate the gain. With this electronic board, it is possible to measure the potential and intensity without disturbing the
-electric field in the ground, with the total input impedance value being estimated at 36 mega-ohms.
-A shortcut between Electrodes A and B will generate excessive currents, whose intensities depend on the type of battery used.
-A lithium ion battery or automobile-type lead-acid battery can deliver a strong enough current to damage the board and, as such,
-constitutes a potential hazard. We therefore recommend adding a 1.5-A fuse between the battery and resistor R9.
-In version 1.02, we have improved the electronic board of measurement. we have added a DC/DC converter to supply the operational amplifiers
-(2 Traco power DC/DCconverter TRN3-1215). These converters allow to limit the suppression of the signal when the injected voltage is higher than 10V.
-We also added 4 capacitors on the +12v inputs of the fast operational amplifiers. These are decoupling capacitors (typically 100nF ceramic)
-between each power supply terminal and ground. The last point, we have added a four very high resistances of 10 MOhm, between the ground and
-the signal input on the operational amplifiers. This prevents the operational amplifiers from overheating.</p>
-<figure class="align-center" id="id1">
-<a class="reference internal image-reference" href="_images/schema_measurement_board1_02.png"><img alt="alternate text" src="_images/schema_measurement_board1_02.png" style="width: 800px; height: 400px;" /></a>
-<figcaption>
-<p><span class="caption-text">Measurement board (Ohmpi version 1.02)</span><a class="headerlink" href="#id1" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-<div class="admonition note">
-<p class="admonition-title">Note</p>
-<p>If you want to have very accurate measurements you can replace the resistors with a tolerance of 1% by resistors with a tolerance of 0.01% which will improve the measurement, but the cost will be higher.</p>
-</div>
-</section>
-<section id="b-implementation">
-<h4>b) Implementation<a class="headerlink" href="#b-implementation" title="Permalink to this headline">¶</a></h4>
-<p>The measurement board must be printed using the PCB file (Source file repository), with components soldered onto
-it by following the steps described below and illustrated in the following figure :</p>
-<ul>
-<li><dl>
-<dt>Step no. 1: test divider bridge</dt><dd><p>For each measurement channel, we have installed a bridge divider, it is necessary to test with ohmmeter the value of the resistances, to adjust each coefficients (coef_p0, coef_p1, coef_p2, coef_p3) in the Ohmpi.py code..</p>
-<blockquote>
-<div><div class="math notranslate nohighlight">
-\[coeff po = (R1 + R2) / R1\]</div>
-<div class="math notranslate nohighlight">
-\[coeff p1 = (R3 + R4) / R3\]</div>
-<div class="math notranslate nohighlight">
-\[coeff p2 = (R7 + R6) / R7\]</div>
-<div class="math notranslate nohighlight">
-\[coeff p3 = (R9 + R8) / R9\]</div>
-<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="linenos">36</span> <span class="sd">"""</span>
-<span class="linenos">37</span><span class="sd"> hardware parameters</span>
-<span class="linenos">38</span><span class="sd"> """</span>
-<span class="linenos">39</span> <span class="n">R_ref</span> <span class="o">=</span> <span class="mi">50</span> <span class="c1"># reference resistance value in ohm</span>
-<span class="linenos">40</span> <span class="n">coef_p0</span> <span class="o">=</span> <span class="mf">2.5</span> <span class="c1"># slope for current conversion for ADS.P0, measurement in V/V</span>
-<span class="linenos">41</span> <span class="n">coef_p1</span> <span class="o">=</span> <span class="mf">2.5</span> <span class="c1"># slope for current conversion for ADS.P1, measurement in V/V</span>
-<span class="linenos">42</span> <span class="n">coef_p2</span> <span class="o">=</span> <span class="mf">2.5</span> <span class="c1"># slope for current conversion for ADS.P2, measurement in V/V</span>
-<span class="linenos">43</span> <span class="n">coef_p3</span> <span class="o">=</span> <span class="mf">2.5</span> <span class="c1"># slope for current conversion for ADS.P3, measurement in V/V</span>
-</pre></div>
-</div>
-<p>The coefficient parameters can be adjusted in lines 40 to 43 of the ohmpi.py code.</p>
-</div></blockquote>
-</dd>
-</dl>
-</li>
-<li><p>Step no. 2: installation of the 1-Kohm resistors with an accuracy of ± 1% (b-in the figure).</p></li>
-<li><p>Step no. 3: installation of the 1.5-Kohm resistors with an accuracy of ± 1%(C-in the figure).</p></li>
-<li><p>Step no. 4: installation of both the black female 1 x 10 header and the 7-blue screw terminal blocks (c-in the figure)</p></li>
-<li><p>Step no. 5: installation of the 50-Ohm reference resistor ± 0.1%, please check the value and correct the line 39 in ohmpi.py code (d-in the figure)</p></li>
-<li><p>Step no. 6: addition of both the ADS115 directly onto the header (pins must be plugged according to the figure) and the LM358N operational amplifiers (pay attention to the orientation) (e-in the figure).</p></li>
-<li><p>Step no. 7: installation of the 10-Mohm resistors with an accuracy of ± 5% (f-in the figure).</p></li>
-<li><p>Step no. 8: installation of the two DC/DC converter TRN3-1215 (h-in the figure).</p></li>
-<li><p>Setp no. 9: installation of the four capacitor on 100-nF/50vDC and the fuse of 10-A (h-in the figure).</p></li>
-</ul>
-<p>1-Kohm and 1.5-Kohm resistors apply to the divider bridge. If, for example, you prefer using a stronger power supply, it would be possible to adjust the divider bridge value by simply modifying these resistors.
-Once all the components have been soldered together, the measurement board can be connected to the Raspberry Pi and the
-battery terminal, according to Figure 9. Between the battery and the TX+ terminal of the measurement board, remember to
-place a fuse holder with a 1.5-A fuse for safety purposes.</p>
-<figure class="align-center" id="id2">
-<a class="reference internal image-reference" href="_images/measurement_board1-02.jpg"><img alt="alternate text" src="_images/measurement_board1-02.jpg" style="width: 800px; height: 700px;" /></a>
-<figcaption>
-<p><span class="caption-text">Measurement circuit board assembly: a) printed circuit board, b) adding the 1-Kohm resistors ± 1%, c)adding the 1.5-Kohm resistors ± 1%, d) adding the black female 1 x 10 header and the 7-blue screw terminal block(2 pin, 3.5-mm pitch), e) adding the 50-ohm reference resistor ± 0.1%, and f) adding the ADS1115 and the LM358N low-power dual operational amplifiers</span><a class="headerlink" href="#id2" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-<figure class="align-center" id="id3">
-<a class="reference internal image-reference" href="_images/measurement_board-2-V1-02.jpg"><img alt="alternate text" src="_images/measurement_board-2-V1-02.jpg" style="width: 800px; height: 700px;" /></a>
-<figcaption>
-<p><span class="caption-text">Measurement board installation with Raspberry Pi</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-</section>
-</section>
-<section id="current-injection-board">
-<h3>Current injection board<a class="headerlink" href="#current-injection-board" title="Permalink to this headline">¶</a></h3>
-<p>To carry out the electrical resistivity measurement, the first step consists of injecting current into the ground.
-In our case, a simple 9-V lead-acid battery is used to create an electrical potential difference that results
-in current circulating into the ground. The current is injected through electrodes A and B (see Fig. 2). This
-injection is controlled via a 4-channel relay module board connected to the Raspberry Pi. The mechanical relay
-module board is shown in Figure 4. Relays 1 and 2 serve to switch on the current source. The common contacts
-of relays 1 and 2 are connected to the positive and negative battery poles, respectively. The normally open
-contacts of both relays are connected to the common contacts of relays 3 and 4. Relays 1 and 2 are connected
-to the GPIO 7 on the Raspberry Pi and therefore activate simultaneously. The role of relays 3 and 4 is to reverse
-the polarity at electrodes A and B. Thus, when relays 3 and 4 are energized by the GPIO 8 in the open position,
-the positive battery pole is connected to electrode A and the negative pole to electrode B. When not energized,
-they remain in the normally closed position. This set-up offers a simple and robust solution to inject current.</p>
-<figure class="align-center" id="id4">
-<a class="reference internal image-reference" href="_images/current_board.jpg"><img alt="alternate text" src="_images/current_board.jpg" style="width: 800px; height: 400px;" /></a>
-<figcaption>
-<p><span class="caption-text">Wiring of the 4-channel relay module board for current injection management</span><a class="headerlink" href="#id4" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-<p>The next step consists of featuring the 4-channel relay module used for current injection and its assembly. The wiring
-between the relays must be carried out in strict accordance with Fig. 10. This card must then be connected to the Raspberry
-Pi and the measurement card. On the Raspberry Pi, it is necessary to connect inputs In1 and In2 to the same GPIO. For this
-purpose, it is necessary to solder together the two pins on the 4-channel relay shield module and connect them to the Raspberry Pi GPIO-7 (Fig. 10). The same must be performed for inputs In3 and In4 with GPIO-8. Connect the GND and 5Vdc pins of
-the relay card’s 4 channels respectively to the GND pin and 5Vcc of the Raspberry Pi. Now connect relays 1, 2, 3 and 4, as
-shown in the diagram, using 1-mm2 cables (red and black in Fig. 10). Lastly, connect the inputs of relay 1 and 2 respectively
-to terminals B and A of the measurement board.</p>
-<figure class="align-center" id="id5">
-<a class="reference internal image-reference" href="_images/installation_current_board_1_02.jpg"><img alt="alternate text" src="_images/installation_current_board_1_02.jpg" style="width: 800px; height: 700px;" /></a>
-<figcaption>
-<p><span class="caption-text">Current injection board installation with Raspberry Pi</span><a class="headerlink" href="#id5" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-<p>Congratulations, you have build a 4 electrodes resistivity-meter.</p>
-</section>
-<section id="frist-four-electrodes-resistivity-mesurement">
-<h3>Frist four electrodes resistivity mesurement<a class="headerlink" href="#frist-four-electrodes-resistivity-mesurement" title="Permalink to this headline">¶</a></h3>
-<p>Under construction !</p>
-<p>Describe the way to valide the first part of the instruction.
-Electrical resistivity measurement on test circuit</p>
-</section>
-</section>
-<section id="multiplexer-implentation">
-<h2>Multiplexer implentation<a class="headerlink" href="#multiplexer-implentation" title="Permalink to this headline">¶</a></h2>
-<p>The resistivity measurement is conducted on four terminals (A, B, M and N). The user could perform each measurement
-by manually plugging four electrodes into the four channel terminals. In practice, ERT requires several tens or thousands
-of measurements conducted on different electrode arrays. A multiplexer is therefore used to connect each channel to one of
-the 32 electrodes stuck into the ground, all of which are connected to the data logger.</p>
-<p>We will describe below how to assemble the four multiplexers (MUX), one per terminal. A multiplexer consists of 2 relay
-modules with 16 channels each. On the first board, on each MUX, 15 relays out of the 16 available will be used. Please note that the suggested
-configuration enables making smaller multiplexers (8 or 16 electrodes only). On the other hand, if you prefer upping to 64 electrodes,
-which is entirely possible, a GPIO channel multiplier will have to be used.
-To prepare the multiplexer, the channels of the two relay boards must be connected according to the wiring diagram shown below.</p>
-<figure class="align-center" id="id6">
-<a class="reference internal image-reference" href="_images/multiplexer_implementation.jpg"><img alt="alternate text" src="_images/multiplexer_implementation.jpg" style="width: 800px; height: 500px;" /></a>
-<figcaption>
-<p><span class="caption-text">Schematic diagram of the wiring of two 16-channel relay shields</span><a class="headerlink" href="#id6" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-<p>For this purpose, 0.5-mm² cables with end caps are used and their length adjusted for each connection in order to produce a clean assembly.
-The length was adjusted so that the distance between the two points to be connected could be directly measured on the board once they had
-been assembled one above the other, in adding an extra 3 cm. The wires at the ends need to be stripped and the end caps added.
-As a final step, connect the cables to the correct connectors. This operation must be repeated in order to carry out all the wiring shown in Figure below.</p>
-<p>Once the operation has been completed, the 16 control pins of each 16-channel relay shield card must be prepared. Each card actually contains 16 input channels
-for activating each relay (Fig. 12). However, we will be activating several relays with a single GPIO (to limit the number of GPIOs used on Raspberry Pi,
-see Section 2.4). To execute this step, it will be necessary to follow the protocol presented in Figure.</p>
-<blockquote>
-<div><figure class="align-center" id="id7">
-<a class="reference internal image-reference" href="_images/connection.jpg"><img alt="alternate text" src="_images/connection.jpg" style="width: 800px; height: 400px;" /></a>
-<figcaption>
-<p><span class="caption-text">Connection to the 16-channel relay shield</span><a class="headerlink" href="#id7" title="Permalink to this image">¶</a></p>
-</figcaption>
-</figure>
-</div></blockquote>
-<p>For the 16-channel relay shield no. 1, these steps must be followed:
-* Position a test circuit with 10 horizontal and 10 vertical holes on the pins of the 16-channel relay shield board.
-* Follow the diagram and solder the pins as shown in Fig.
-* Lastly, solder 0.5-mm² wires 1 m in length to the test circuit.</p>
-<p>For relay shield no. 2, follow the same procedure, but solder all the pins together (d-e-f).
-This same operation must be repeated for the other three multiplexers as well.
-The next step consists of connecting the relay card inputs to the Raspberry Pi according to Table 5 for all four multiplexers.</p>
+<section id="step-n2-assembly-of-the-measurement-board">
+<h2><strong>STEP n°2</strong>: Assembly of the measurement board<a class="headerlink" href="#step-n2-assembly-of-the-measurement-board" title="Permalink to this headline">¶</a></h2>
<table class="docutils align-default">
<colgroup>
-<col style="width: 34%" />
-<col style="width: 11%" />
-<col style="width: 11%" />
-<col style="width: 11%" />
-<col style="width: 11%" />
-<col style="width: 23%" />
+<col style="width: 100%" />
</colgroup>
<tbody>
-<tr class="row-odd"><td rowspan="2"></td>
-<td colspan="4"><p>Relay shield n°1</p></td>
-<td><p>Relay Shield n°2</p></td>
-</tr>
-<tr class="row-even"><td><p>Pin 1</p></td>
-<td><p>Pin 2-3</p></td>
-<td><p>Pin 4-7</p></td>
-<td><p>Pin 8-16</p></td>
-<td><p>Pin 1- 16</p></td>
-</tr>
-<tr class="row-odd"><td><p>Multiplexer A</p></td>
-<td><p>12</p></td>
-<td><p>16</p></td>
-<td><p>20</p></td>
-<td><p>21</p></td>
-<td><p>26</p></td>
-</tr>
-<tr class="row-even"><td><p>Multiplexer B</p></td>
-<td><p>18</p></td>
-<td><p>23</p></td>
-<td><p>24</p></td>
-<td><p>25</p></td>
-<td><p>19</p></td>
-</tr>
-<tr class="row-odd"><td><p>Multiplexer M</p></td>
-<td><p>06</p></td>
-<td><p>13</p></td>
-<td><p>04</p></td>
-<td><p>17</p></td>
-<td><p>27</p></td>
-</tr>
-<tr class="row-even"><td><p>Multiplexer N</p></td>
-<td><p>22</p></td>
-<td><p>10</p></td>
-<td><p>09</p></td>
-<td><p>11</p></td>
-<td><p>05</p></td>
+<tr class="row-odd"><td><p><strong>Required components</strong></p></td>
</tr>
</tbody>
</table>
-<blockquote>
-<div><p>Connection of the GPIOs to each multiplexer</p>
-</div></blockquote>
-</section>
-<section id="electrode-connection">
-<h2>Electrode connection<a class="headerlink" href="#electrode-connection" title="Permalink to this headline">¶</a></h2>
-<p>At this point, all that remains is to connect the electrodes of each multiplexer to a terminal block (Fig. 13). In our set-up, screw terminals assembled on a din rail were used.
-According to the chosen multiplexer configuration, all the relays of each multiplexer will be connected to an electrode and, consequently, each electrode will have four incoming
-connections. Instead of having four cables connecting an electrode terminal to each multiplexer, we recommend using the cable assembly shown in the following Figure.</p>
-<figure class="align-center" id="id8">
-<a class="reference internal image-reference" href="_images/cable.jpg"><img alt="alternate text" src="_images/cable.jpg" style="width: 800px; height: 300px;" /></a>
-<figcaption>
-<p><span class="caption-text">Wire cabling for multiplexer and terminal screw connection</span><a class="headerlink" href="#id8" title="Permalink to this image">¶</a></p>
-</figcaption>
+<figure class="align-center">
+<a class="reference internal image-reference" href="_images/00_mes_board_components.jpg"><img alt="alternate text" src="_images/00_mes_board_components.jpg" style="width: 600px; height: 450px;" /></a>
</figure>
-<p>the next figure provides an example of multiplexer relay connections for electrode no. 1: this electrode of multiplexer MUX A must be connected to electrode no. 1 of MUX B. Moreover, electrode no. 1 of MUX B
-must be connected to electrode no. 1 of MUX N, which in turn must be connected to electrode no. 1 of MUX M. Lastly, electrode no. 1 of MUX M is connected to the terminal block.
-This operation must be repeated for all 32 electrodes.</p>
-<figure class="align-center" id="id9">
-<a class="reference internal image-reference" href="_images/electrode_cable.jpg"><img alt="alternate text" src="_images/electrode_cable.jpg" style="width: 800px; height: 800px;" /></a>
-<figcaption>
-<p><span class="caption-text">Example of a multiplexer connection to the screw terminal for electrode no. 1.</span><a class="headerlink" href="#id9" title="Permalink to this image">¶</a></p>
-</figcaption>
+<section id="description">
+<h3>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h3>
+<figure class="align-center">
+<a class="reference internal image-reference" href="_images/schema_measurement_board.jpg"><img alt="alternate text" src="_images/schema_measurement_board.jpg" style="width: 600px; height: 450px;" /></a>
</figure>
-<div class="admonition warning">
-<p class="admonition-title">Warning</p>
-<p>The 16 channel relay cards exist in 5-V and 12-V , in the bottom figure we have 12-V cards that we will directly connect to the battery.
-In case you bought 16 channel relay 5-V cards, you will need to add a DC/DC 12-V/5-V converter. You can use a STEP DOWN MODULE DC-DC (Velleman WPM404) and set the voltage to 5V with the potentiometer.</p>
-</div>
-</section>
-<section id="operating-instruction">
-<h2>Operating instruction<a class="headerlink" href="#operating-instruction" title="Permalink to this headline">¶</a></h2>
-<section id="preliminary-procedure-only-for-the-initial-operation">
-<h3>Preliminary procedure (Only for the initial operation)<a class="headerlink" href="#preliminary-procedure-only-for-the-initial-operation" title="Permalink to this headline">¶</a></h3>
-<p>The open source code must be downloaded at the Open Science Framework source file repository for this manuscript (<a class="reference external" href="https://osf.io/dzwb4/">https://osf.io/dzwb4/</a>)
-or at the following Gitlab repository address: <a class="reference external" href="https://gitlab.irstea.fr/reversaal/OhmPi">https://gitlab.irstea.fr/reversaal/OhmPi</a>. The code must be then unzipped into a selected folder (e.g. OhmPi-master). A “readme†file
-is proposed in the directory to assist with installation of the software and required python packages. It is strongly recommended to create a python virtual environment for installing
-the required packages and running the code.</p>
-</section>
-<section id="startup-procedure">
-<h3>Startup procedure<a class="headerlink" href="#startup-procedure" title="Permalink to this headline">¶</a></h3>
-<p>As an initial operating instruction, all batteries must be disconnected before any hardware handling. Ensure that the battery is charged at full capacity. Plug all the electrodes (32 or fewer)
-into the screw terminals. The Raspberry Pi must be plugged into a computer screen, with a mouse and keyboard accessed remotely. The Raspberry Pi must then be plugged into the power supply
-(for laboratory measurements) or a power bank (5V - 2A for field measurements). At this point, you’ll need to access the Raspbian operating system. Inside the previously created folder “ohmPiâ€,
-the protocol file “ABMN.txt†must be created or modified; this file contains all quadrupole ABMN numeration (an example is proposed with the source code). Some input parameters of the main “ohmpi.pyâ€
-function may be adjusted/optimized depending on the measurement attributes. For example, both the current injection duration and number of stacks can be adjusted. At this point, the9 V and 12-V battery can be
-plugged into the hardware; the “ohmpi.py†source code must be run within a python3 environment (or a virtual environment if one has been created) either in the terminal or using Thonny. You should now
-hear the characteristic sound of a relay switching as a result of electrode permutation. After each quadrupole measurement, the potential difference as well as the current intensity and resistance
-are displayed on the screen. A measurement file is automatically created and named “measure.csvâ€; it will be placed in the same folder.</p>
-</section>
-<section id="electrical-resistivity-measurement-parameters-description">
-<h3>Electrical resistivity measurement parameters description<a class="headerlink" href="#electrical-resistivity-measurement-parameters-description" title="Permalink to this headline">¶</a></h3>
-<p>In the version 1.02, the measurement parameters are in the Jason file (ohmpi_param.json).</p>
-<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="linenos">1</span> <span class="n">nb_electrodes</span> <span class="o">=</span> <span class="mi">32</span> <span class="c1"># maximum number of electrodes on the resistivity meter</span>
-<span class="linenos">2</span> <span class="n">injection_duration</span> <span class="o">=</span> <span class="mf">0.5</span> <span class="c1"># Current injection duration in second</span>
-<span class="linenos">3</span> <span class="n">nbr_meas</span><span class="o">=</span> <span class="mi">1</span> <span class="c1"># Number of times the quadripole sequence is repeated</span>
-<span class="linenos">4</span> <span class="n">sequence_delay</span><span class="o">=</span> <span class="mi">30</span> <span class="c1"># Delay in seconds between 2 sequences</span>
-<span class="linenos">5</span> <span class="n">stack</span><span class="o">=</span> <span class="mi">1</span> <span class="c1"># repetition of the current injection for each quadripole</span>
-<span class="linenos">6</span> <span class="n">export_path</span><span class="o">=</span> <span class="s2">"home/pi/Desktop/measurement.csv"</span>
-</pre></div>
-</div>
-</section>
-</section>
-<section id="complete-list-of-components">
-<h2>Complete list of components<a class="headerlink" href="#complete-list-of-components" title="Permalink to this headline">¶</a></h2>
-<div class="admonition warning">
-<p class="admonition-title">Warning</p>
-<p>The list evolve a little bit after the publication of the article, it is necessary to refer to this list, the article is out of date</p>
-</div>
-<table class="colwidths-given docutils align-default" id="id10">
-<caption><span class="caption-text">List of components</span><a class="headerlink" href="#id10" title="Permalink to this table">¶</a></caption>
+<p>Figure shows the general diagram for the electronic measurement board developed.
+We have developed a complete measurement board. To measure electrical resistivity with Raspberry Pi, two ADS1115 were used,one for the voltage measurement one for the current measurement, as proposed by Florsch [7]. The ADS1115
+is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. The advantage of ADS1115 is that the
+input signal value could lie between - to + 6.114 V. Pour la mesure du current nous avons intégré directement le composant ina282, qui permet de réaliser des mesure de courant de précision autour d’une resistance de shunt</p>
+<table class="docutils align-center">
<colgroup>
-<col style="width: 8%" />
-<col style="width: 18%" />
-<col style="width: 18%" />
-<col style="width: 18%" />
-<col style="width: 18%" />
-<col style="width: 18%" />
+<col style="width: 50%" />
+<col style="width: 50%" />
</colgroup>
-<thead>
-<tr class="row-odd"><th class="head"><p>Component</p></th>
-<th class="head"><p>Number</p></th>
-<th class="head"><p>Cost per unit</p></th>
-<th class="head"><p>Total cost</p></th>
-<th class="head"><p>Manufacturer</p></th>
-<th class="head"><p>Manufacturer s reference</p></th>
-</tr>
-</thead>
<tbody>
-<tr class="row-even"><td><p>Raspberry Pi 3 Model B+</p></td>
-<td><p>1</p></td>
-<td><p>37</p></td>
-<td><p>37</p></td>
-<td><p>Raspberry</p></td>
-<td><p>Raspberry Pi 3 Model B</p></td>
-</tr>
-<tr class="row-odd"><td><p>Raspberry Pi 1 2 and 3 Power Supply</p></td>
-<td><p>1</p></td>
-<td><p>8.37</p></td>
-<td><p>8.37</p></td>
-<td><p>Raspberry</p></td>
-<td><p>Raspberry Pi 1 2 and 3 Power Supply</p></td>
-</tr>
-<tr class="row-even"><td><p>SainSmart 16-Channel 12V Relay</p></td>
-<td><p>8</p></td>
-<td><p>24.99</p></td>
-<td><p>199.92</p></td>
-<td><p>Sain Smart</p></td>
-<td><p>101-70-103</p></td>
-</tr>
-<tr class="row-odd"><td><p>4-Channel 5V Relay Module</p></td>
-<td><p>1</p></td>
-<td><p>7.99</p></td>
-<td><p>7.99</p></td>
-<td><p>Sain Smart</p></td>
-<td><p>20-018-101-CMS</p></td>
-</tr>
-<tr class="row-even"><td><p>cable 1X1 mm2 (50 m)</p></td>
-<td><p>1</p></td>
-<td><p>19.66</p></td>
-<td><p>19.66</p></td>
-<td><p>TRU COMPONENTS</p></td>
-<td><p>1568649</p></td>
-</tr>
-<tr class="row-odd"><td><p>cable 1X0.5 mm2 (100 m)</p></td>
-<td><p>1</p></td>
-<td><p>29.71</p></td>
-<td><p>29.71</p></td>
-<td><p>TRU COMPONENTS</p></td>
-<td><p>1565235</p></td>
-</tr>
-<tr class="row-even"><td><p>Printed circuit board (packaging quantity x 3)</p></td>
-<td><p>1</p></td>
-<td><p>12</p></td>
-<td><p>12</p></td>
-<td><p>Asler</p></td>
-<td><p>0</p></td>
-</tr>
-<tr class="row-odd"><td><p>Header sets 1x10</p></td>
-<td><p>1</p></td>
-<td><p>2.68</p></td>
-<td><p>2.68</p></td>
-<td><p>Samtec</p></td>
-<td><p>SSW-110-02-G-S</p></td>
-</tr>
-<tr class="row-even"><td><p>Dual screw terminal (3.5-mm pitch)</p></td>
-<td><p>7</p></td>
-<td><p>0.648</p></td>
-<td><p>4.55</p></td>
-<td><p>RS PRO</p></td>
-<td><p>897-1332</p></td>
-</tr>
-<tr class="row-odd"><td><p>Resistor 1 Kohm 0.5W +- 0.1%</p></td>
-<td><p>4</p></td>
-<td><p>0.858</p></td>
-<td><p>3.44</p></td>
-<td><p>TE Connectivity</p></td>
-<td><p>H81K0BYA</p></td>
-</tr>
-<tr class="row-even"><td><p>Resistor 1.5 Kohms +- 0.1%</p></td>
-<td><p>4</p></td>
-<td><p>0.627</p></td>
-<td><p>2.52</p></td>
-<td><p>TE Connectivity</p></td>
-<td><p>H81K5BYA</p></td>
-</tr>
-<tr class="row-odd"><td><p>Resistor 50 +- 0.1%</p></td>
-<td><p>1</p></td>
-<td><p>8.7</p></td>
-<td><p>8.7</p></td>
-<td><p>TE Connectivity</p></td>
-<td><p>UPW50B50RV</p></td>
-</tr>
-<tr class="row-even"><td><p>LM358N AMP-o</p></td>
-<td><p>4</p></td>
-<td><p>0.8</p></td>
-<td><p>2.4</p></td>
-<td><p>Texas Instruments</p></td>
-<td><p>LM358AN/NOPB</p></td>
-</tr>
-<tr class="row-odd"><td><p>ADS1115</p></td>
-<td><p>1</p></td>
-<td><p>11.9</p></td>
-<td><p>11.9</p></td>
-<td><p>Adafruit</p></td>
-<td><p>1083</p></td>
-</tr>
-<tr class="row-even"><td><p>12V battery 7ah</p></td>
-<td><p>1</p></td>
-<td><p>19.58</p></td>
-<td><p>19.58</p></td>
-<td><p>RS PRO</p></td>
-<td><p>537-5488</p></td>
+<tr class="row-odd"><td><img alt="_images/01_mes_board.jpg" src="_images/01_mes_board.jpg" />
+</td>
+<td></td>
</tr>
-<tr class="row-odd"><td><p>Battery Holder Type D LR20 (9V)</p></td>
-<td><p>1</p></td>
-<td><p>3.43</p></td>
-<td><p>3.43</p></td>
-<td><p>RS PRO</p></td>
-<td><p>185-4686</p></td>
+</tbody>
+</table>
+<table class="docutils align-center">
+<colgroup>
+<col style="width: 50%" />
+<col style="width: 50%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td></td>
+<td><img alt="_images/02_mes_board.jpg" src="_images/02_mes_board.jpg" />
+</td>
</tr>
-<tr class="row-even"><td><p>Ferrule Crimp Terminal (1 mm2) (500 pieces)</p></td>
-<td><p>1</p></td>
-<td><p>30.48</p></td>
-<td><p>30.48</p></td>
-<td><p>WEIDMULLER</p></td>
-<td><p>9004330000</p></td>
+</tbody>
+</table>
+<table class="docutils align-center">
+<colgroup>
+<col style="width: 50%" />
+<col style="width: 50%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td><img alt="_images/03_mes_board.jpg" src="_images/03_mes_board.jpg" />
+</td>
+<td></td>
</tr>
-<tr class="row-odd"><td><p>Electrical Crimp Terminal (0.5 mm2) (100 piece)</p></td>
-<td><p>1</p></td>
-<td><p>6.38</p></td>
-<td><p>6.38</p></td>
-<td><p>AMP - TE CONNECTIVITY</p></td>
-<td><p>966067-1</p></td>
+</tbody>
+</table>
+<table class="docutils align-center">
+<colgroup>
+<col style="width: 50%" />
+<col style="width: 50%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td></td>
+<td><img alt="_images/04_mes_board.jpg" src="_images/04_mes_board.jpg" />
+</td>
</tr>
-<tr class="row-even"><td><p>Fuse 1.0 A</p></td>
-<td><p>1</p></td>
-<td><p>0.2</p></td>
+</tbody>
+</table>
+<table class="docutils align-center">
+<colgroup>
+<col style="width: 50%" />
+<col style="width: 50%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td><img alt="_images/05_mes_board.jpg" src="_images/05_mes_board.jpg" />
+</td>
<td></td>
-<td><p>LITTELFUSE</p></td>
-<td><p>0251001.PAT1L</p></td>
-</tr>
-<tr class="row-odd"><td><p>Capacitor 100nF 50Vdc 10% Ceramic</p></td>
-<td><p>4</p></td>
-<td><p>0.2</p></td>
-<td><p>0.8</p></td>
-<td><p>KEMET</p></td>
-<td><p>C320C104K1</p></td>
</tr>
-<tr class="row-even"><td><p>DC/DC converter 12 to 24V</p></td>
-<td><p>2</p></td>
-<td><p>26.72</p></td>
-<td><p>53.44</p></td>
-<td><p>TracoPower</p></td>
-<td><p>TRN 3-1215</p></td>
+</tbody>
+</table>
+<table class="docutils align-center">
+<colgroup>
+<col style="width: 50%" />
+<col style="width: 50%" />
+</colgroup>
+<tbody>
+<tr class="row-odd"><td></td>
+<td><img alt="_images/06_mes_board.jpg" src="_images/06_mes_board.jpg" />
+</td>
</tr>
</tbody>
</table>
</section>
+</section>
</section>
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diff --git a/sphinx/build/html/_sources/V2_00.rst.txt b/sphinx/build/html/_sources/V2_00.rst.txt
index 5cffe76fe42144dafa816bb388dd2314b5826890..6a511baef4a0479a24a3b106c5fa23f41975688d 100644
--- a/sphinx/build/html/_sources/V2_00.rst.txt
+++ b/sphinx/build/html/_sources/V2_00.rst.txt
@@ -237,340 +237,73 @@ If you decided to use a virtual environment, it is necessary to setup Thonny Pyt
9- Close thonny to save modifications
-Assembly of the measuring/current injection cards, and connection with the Raspberry Pi
-*****************************************************************************************
+**STEP n°2**: Assembly of the measurement board
+****************************************************
-Electrical resistivity measurements board
-==========================================
++----------------------------------------------------+
+| **Required components** |
++----------------------------------------------------+
-a) Description
------------------------------
-
-To measure electrical resistivity with Raspberry Pi, an ADS1115 was introduced, as proposed by Florsch [7]. The ADS1115
-is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. Its value has been set at 2/3 in this study. The
-input signal value could lie between - to + 6.114 V. The ADS1115 is mounted on a board adapted from an in-house design.
-Figure 5 shows the general diagram for the electronic measurement board developed. This figure also displays the test
-circuit used to test the board in the laboratory, which mimics the behavior of a soil subjected to current injection.
-In this test circuit, resistance R11 represents the soil resistance.
-Soil resistance R11 is connected to electrodes A and B for the current injection. Resistors R10 and R12 constitute
-the contact resistances between soil and electrodes; they are typically made of stainless steel. The battery, which
-allows for direct current injection, is connected in series with resistors R10, R11 and R12. In this part of the board,
-resistance R9 has been added to measure the current flowing between electrodes A and B. This resistance value has been
-set at 50 ohms in order to ensure:
-• a precise resistance,
-• a resistance less than the sum of resistors R10, R11 and R12; indeed, R10 and R12 generally lie between 100 and 5,000 ohms.
-To measure the current intensity between A and B, the electrical potential difference at the pole of the reference resistor (R9)
-is measured. The intensity (in mA) is calculated by inserting the resulting value into the following: ?
-To measure the potential difference needed to measure current intensity, the ADS 1115 is connected to the ground of the circuit.
-In our case, the ground reference is electrode B. The analog inputs A1 and A0 of the ADS1115 are connected to each pole of the
-reference resistor (R9). In order to increase input impedance and adapt the signal gain, tracking amplifiers have been included
-and completed by a divider bridge (R5, R8, R6 and R7) located between the two amplifiers. The resistance of the divider bridge
-ensures that the signal remains between 0 and 5 V, in accordance with the ADS1115 signal gain. To measure the potential difference,
-the M and N electrodes are connected to analog inputs A2 and A3 of the ADS 1115. Between the ADC and the electrodes, two tracking
-amplifiers and a divider bridge have been positioned so as to obtain a potential lying within the 0-5 V range at the analog input of the ADS 1115.
-Let's note that the potential difference value would equal the potential measured with ADS1115 multiplied by the voltage reduction
-value of the divider bridge (see Section 5.2). Despite the use of high-resolution resistance (i.e. accurate to within 1%), it is
-still necessary to calibrate the divider bridge using a precision voltmeter. For this purpose, the input and output potentials
-of the divider bridge must be measured using an equivalent circuit for various electrical potential values. These values serve
-to calculate the gain. With this electronic board, it is possible to measure the potential and intensity without disturbing the
-electric field in the ground, with the total input impedance value being estimated at 36 mega-ohms.
-A shortcut between Electrodes A and B will generate excessive currents, whose intensities depend on the type of battery used.
-A lithium ion battery or automobile-type lead-acid battery can deliver a strong enough current to damage the board and, as such,
-constitutes a potential hazard. We therefore recommend adding a 1.5-A fuse between the battery and resistor R9.
-In version 1.02, we have improved the electronic board of measurement. we have added a DC/DC converter to supply the operational amplifiers
-(2 Traco power DC/DCconverter TRN3-1215). These converters allow to limit the suppression of the signal when the injected voltage is higher than 10V.
-We also added 4 capacitors on the +12v inputs of the fast operational amplifiers. These are decoupling capacitors (typically 100nF ceramic)
-between each power supply terminal and ground. The last point, we have added a four very high resistances of 10 MOhm, between the ground and
-the signal input on the operational amplifiers. This prevents the operational amplifiers from overheating.
-
-.. figure:: schema_measurement_board1_02.png
- :width: 800px
- :align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Measurement board (Ohmpi version 1.02)
-
-.. note::
- If you want to have very accurate measurements you can replace the resistors with a tolerance of 1% by resistors with a tolerance of 0.01% which will improve the measurement, but the cost will be higher.
-
-
-
-b) Implementation
---------------------------------
-The measurement board must be printed using the PCB file (Source file repository), with components soldered onto
-it by following the steps described below and illustrated in the following figure :
-
-* Step no. 1: test divider bridge
- For each measurement channel, we have installed a bridge divider, it is necessary to test with ohmmeter the value of the resistances, to adjust each coefficients (coef_p0, coef_p1, coef_p2, coef_p3) in the Ohmpi.py code..
-
- .. math::
- coeff po = (R1 + R2) / R1
-
- .. math::
- coeff p1 = (R3 + R4) / R3
-
- .. math::
- coeff p2 = (R7 + R6) / R7
-
- .. math::
- coeff p3 = (R9 + R8) / R9
-
- .. code-block:: python
- :linenos:
- :lineno-start: 36
-
- """
- hardware parameters
- """
- R_ref = 50 # reference resistance value in ohm
- coef_p0 = 2.5 # slope for current conversion for ADS.P0, measurement in V/V
- coef_p1 = 2.5 # slope for current conversion for ADS.P1, measurement in V/V
- coef_p2 = 2.5 # slope for current conversion for ADS.P2, measurement in V/V
- coef_p3 = 2.5 # slope for current conversion for ADS.P3, measurement in V/V
-
- The coefficient parameters can be adjusted in lines 40 to 43 of the ohmpi.py code.
-
-
-* Step no. 2: installation of the 1-Kohm resistors with an accuracy of ± 1% (b-in the figure).
-* Step no. 3: installation of the 1.5-Kohm resistors with an accuracy of ± 1%(C-in the figure).
-* Step no. 4: installation of both the black female 1 x 10 header and the 7-blue screw terminal blocks (c-in the figure)
-* Step no. 5: installation of the 50-Ohm reference resistor ± 0.1%, please check the value and correct the line 39 in ohmpi.py code (d-in the figure)
-* Step no. 6: addition of both the ADS115 directly onto the header (pins must be plugged according to the figure) and the LM358N operational amplifiers (pay attention to the orientation) (e-in the figure).
-* Step no. 7: installation of the 10-Mohm resistors with an accuracy of ± 5% (f-in the figure).
-* Step no. 8: installation of the two DC/DC converter TRN3-1215 (h-in the figure).
-* Setp no. 9: installation of the four capacitor on 100-nF/50vDC and the fuse of 10-A (h-in the figure).
-
-1-Kohm and 1.5-Kohm resistors apply to the divider bridge. If, for example, you prefer using a stronger power supply, it would be possible to adjust the divider bridge value by simply modifying these resistors.
-Once all the components have been soldered together, the measurement board can be connected to the Raspberry Pi and the
-battery terminal, according to Figure 9. Between the battery and the TX+ terminal of the measurement board, remember to
-place a fuse holder with a 1.5-A fuse for safety purposes.
-
-.. figure:: measurement_board1-02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Measurement circuit board assembly: a) printed circuit board, b) adding the 1-Kohm resistors ± 1%, c)adding the 1.5-Kohm resistors ± 1%, d) adding the black female 1 x 10 header and the 7-blue screw terminal block(2 pin, 3.5-mm pitch), e) adding the 50-ohm reference resistor ± 0.1%, and f) adding the ADS1115 and the LM358N low-power dual operational amplifiers
-
-.. figure:: measurement_board-2-V1-02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Measurement board installation with Raspberry Pi
-
-Current injection board
-=======================
-
-To carry out the electrical resistivity measurement, the first step consists of injecting current into the ground.
-In our case, a simple 9-V lead-acid battery is used to create an electrical potential difference that results
-in current circulating into the ground. The current is injected through electrodes A and B (see Fig. 2). This
-injection is controlled via a 4-channel relay module board connected to the Raspberry Pi. The mechanical relay
-module board is shown in Figure 4. Relays 1 and 2 serve to switch on the current source. The common contacts
-of relays 1 and 2 are connected to the positive and negative battery poles, respectively. The normally open
-contacts of both relays are connected to the common contacts of relays 3 and 4. Relays 1 and 2 are connected
-to the GPIO 7 on the Raspberry Pi and therefore activate simultaneously. The role of relays 3 and 4 is to reverse
-the polarity at electrodes A and B. Thus, when relays 3 and 4 are energized by the GPIO 8 in the open position,
-the positive battery pole is connected to electrode A and the negative pole to electrode B. When not energized,
-they remain in the normally closed position. This set-up offers a simple and robust solution to inject current.
-
-.. figure:: current_board.jpg
- :width: 800px
- :align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Wiring of the 4-channel relay module board for current injection management
-
-The next step consists of featuring the 4-channel relay module used for current injection and its assembly. The wiring
-between the relays must be carried out in strict accordance with Fig. 10. This card must then be connected to the Raspberry
-Pi and the measurement card. On the Raspberry Pi, it is necessary to connect inputs In1 and In2 to the same GPIO. For this
-purpose, it is necessary to solder together the two pins on the 4-channel relay shield module and connect them to the Raspberry Pi GPIO-7 (Fig. 10). The same must be performed for inputs In3 and In4 with GPIO-8. Connect the GND and 5Vdc pins of
-the relay card’s 4 channels respectively to the GND pin and 5Vcc of the Raspberry Pi. Now connect relays 1, 2, 3 and 4, as
-shown in the diagram, using 1-mm2 cables (red and black in Fig. 10). Lastly, connect the inputs of relay 1 and 2 respectively
-to terminals B and A of the measurement board.
-
-.. figure:: installation_current_board_1_02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Current injection board installation with Raspberry Pi
-
-
-Congratulations, you have build a 4 electrodes resistivity-meter.
+.. figure:: mesure/00_mes_board_components.jpg
+ :width: 600px
+ :align: center
+ :height: 450px
+ :alt: alternate text
+ :figclass: align-center
-Frist four electrodes resistivity mesurement
-============================================
+Description
+==========================================
-Under construction !
+.. figure:: schema_measurement_board.jpg
+ :width: 600px
+ :align: center
+ :height: 450px
+ :alt: alternate text
+ :figclass: align-center
-Describe the way to valide the first part of the instruction.
-Electrical resistivity measurement on test circuit
+Figure shows the general diagram for the electronic measurement board developed.
+We have developed a complete measurement board. To measure electrical resistivity with Raspberry Pi, two ADS1115 were used,one for the voltage measurement one for the current measurement, as proposed by Florsch [7]. The ADS1115
+is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. The advantage of ADS1115 is that the
+input signal value could lie between - to + 6.114 V. Pour la mesure du current nous avons intégré directement le composant ina282, qui permet de réaliser des mesure de courant de précision autour d'une resistance de shunt
-
-Multiplexer implentation
-*************************
-The resistivity measurement is conducted on four terminals (A, B, M and N). The user could perform each measurement
-by manually plugging four electrodes into the four channel terminals. In practice, ERT requires several tens or thousands
-of measurements conducted on different electrode arrays. A multiplexer is therefore used to connect each channel to one of
-the 32 electrodes stuck into the ground, all of which are connected to the data logger.
-
-
-We will describe below how to assemble the four multiplexers (MUX), one per terminal. A multiplexer consists of 2 relay
-modules with 16 channels each. On the first board, on each MUX, 15 relays out of the 16 available will be used. Please note that the suggested
-configuration enables making smaller multiplexers (8 or 16 electrodes only). On the other hand, if you prefer upping to 64 electrodes,
-which is entirely possible, a GPIO channel multiplier will have to be used.
-To prepare the multiplexer, the channels of the two relay boards must be connected according to the wiring diagram shown below.
-
-.. figure:: multiplexer_implementation.jpg
- :width: 800px
+.. table::
:align: center
- :height: 500px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/01_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Schematic diagram of the wiring of two 16-channel relay shields
-
-
-For this purpose, 0.5-mm² cables with end caps are used and their length adjusted for each connection in order to produce a clean assembly.
-The length was adjusted so that the distance between the two points to be connected could be directly measured on the board once they had
-been assembled one above the other, in adding an extra 3 cm. The wires at the ends need to be stripped and the end caps added.
-As a final step, connect the cables to the correct connectors. This operation must be repeated in order to carry out all the wiring shown in Figure below.
-
-Once the operation has been completed, the 16 control pins of each 16-channel relay shield card must be prepared. Each card actually contains 16 input channels
-for activating each relay (Fig. 12). However, we will be activating several relays with a single GPIO (to limit the number of GPIOs used on Raspberry Pi,
-see Section 2.4). To execute this step, it will be necessary to follow the protocol presented in Figure.
-
- .. figure:: connection.jpg
- :width: 800px
+.. table::
:align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Connection to the 16-channel relay shield
-
-For the 16-channel relay shield no. 1, these steps must be followed:
-* Position a test circuit with 10 horizontal and 10 vertical holes on the pins of the 16-channel relay shield board.
-* Follow the diagram and solder the pins as shown in Fig.
-* Lastly, solder 0.5-mm² wires 1 m in length to the test circuit.
-
-For relay shield no. 2, follow the same procedure, but solder all the pins together (d-e-f).
-This same operation must be repeated for the other three multiplexers as well.
-The next step consists of connecting the relay card inputs to the Raspberry Pi according to Table 5 for all four multiplexers.
-
-
-+-------------------------------+-------------------------------------------+---------------------+
-| |Relay shield n°1 |Relay Shield n°2 |
-| +----------+----------+----------+----------+---------------------+
-| |Pin 1 |Pin 2-3 |Pin 4-7 |Pin 8-16 |Pin 1- 16 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer A |12 |16 |20 |21 |26 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer B |18 |23 |24 |25 |19 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer M |06 |13 |04 |17 |27 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer N |22 |10 |09 |11 |05 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-
- Connection of the GPIOs to each multiplexer
-
-
-Electrode connection
-*************************
-At this point, all that remains is to connect the electrodes of each multiplexer to a terminal block (Fig. 13). In our set-up, screw terminals assembled on a din rail were used.
-According to the chosen multiplexer configuration, all the relays of each multiplexer will be connected to an electrode and, consequently, each electrode will have four incoming
-connections. Instead of having four cables connecting an electrode terminal to each multiplexer, we recommend using the cable assembly shown in the following Figure.
-
-.. figure:: cable.jpg
- :width: 800px
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/02_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
+.. table::
:align: center
- :height: 300px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/03_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Wire cabling for multiplexer and terminal screw connection
-
-the next figure provides an example of multiplexer relay connections for electrode no. 1: this electrode of multiplexer MUX A must be connected to electrode no. 1 of MUX B. Moreover, electrode no. 1 of MUX B
-must be connected to electrode no. 1 of MUX N, which in turn must be connected to electrode no. 1 of MUX M. Lastly, electrode no. 1 of MUX M is connected to the terminal block.
-This operation must be repeated for all 32 electrodes.
-
-.. figure:: electrode_cable.jpg
- :width: 800px
+.. table::
+ :align: center
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/04_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
+.. table::
:align: center
- :height: 800px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/05_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Example of a multiplexer connection to the screw terminal for electrode no. 1.
-
-.. warning::
- The 16 channel relay cards exist in 5-V and 12-V , in the bottom figure we have 12-V cards that we will directly connect to the battery.
- In case you bought 16 channel relay 5-V cards, you will need to add a DC/DC 12-V/5-V converter. You can use a STEP DOWN MODULE DC-DC (Velleman WPM404) and set the voltage to 5V with the potentiometer.
-
-Operating instruction
-*************************
-
-Preliminary procedure (Only for the initial operation)
-======================================================
-The open source code must be downloaded at the Open Science Framework source file repository for this manuscript (https://osf.io/dzwb4/)
-or at the following Gitlab repository address: https://gitlab.irstea.fr/reversaal/OhmPi. The code must be then unzipped into a selected folder (e.g. OhmPi-master). A “readme†file
-is proposed in the directory to assist with installation of the software and required python packages. It is strongly recommended to create a python virtual environment for installing
-the required packages and running the code.
-
-
-Startup procedure
-==================
-As an initial operating instruction, all batteries must be disconnected before any hardware handling. Ensure that the battery is charged at full capacity. Plug all the electrodes (32 or fewer)
-into the screw terminals. The Raspberry Pi must be plugged into a computer screen, with a mouse and keyboard accessed remotely. The Raspberry Pi must then be plugged into the power supply
-(for laboratory measurements) or a power bank (5V - 2A for field measurements). At this point, you'll need to access the Raspbian operating system. Inside the previously created folder “ohmPiâ€,
-the protocol file “ABMN.txt†must be created or modified; this file contains all quadrupole ABMN numeration (an example is proposed with the source code). Some input parameters of the main “ohmpi.pyâ€
-function may be adjusted/optimized depending on the measurement attributes. For example, both the current injection duration and number of stacks can be adjusted. At this point, the9 V and 12-V battery can be
-plugged into the hardware; the "ohmpi.py" source code must be run within a python3 environment (or a virtual environment if one has been created) either in the terminal or using Thonny. You should now
-hear the characteristic sound of a relay switching as a result of electrode permutation. After each quadrupole measurement, the potential difference as well as the current intensity and resistance
-are displayed on the screen. A measurement file is automatically created and named "measure.csv"; it will be placed in the same folder.
-
-Electrical resistivity measurement parameters description
-==========================================================
-
-In the version 1.02, the measurement parameters are in the Jason file (ohmpi_param.json).
-
-.. code-block:: python
- :linenos:
- :lineno-start: 1
-
-
- nb_electrodes = 32 # maximum number of electrodes on the resistivity meter
- injection_duration = 0.5 # Current injection duration in second
- nbr_meas= 1 # Number of times the quadripole sequence is repeated
- sequence_delay= 30 # Delay in seconds between 2 sequences
- stack= 1 # repetition of the current injection for each quadripole
- export_path= "home/pi/Desktop/measurement.csv"
-
-
-
-Complete list of components
-*******************************
-.. warning::
- The list evolve a little bit after the publication of the article, it is necessary to refer to this list, the article is out of date
-
-
-.. csv-table:: List of components
- :file: C:\Users\remi.clement\Documents\28_ohmpi_all_git\master\sphinx\source\list - 1_02.csv
- :widths: 30, 70, 70, 70, 70,70
- :header-rows: 1
-
-
+.. table::
+ :align: center
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/06_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
diff --git a/sphinx/build/html/index.html b/sphinx/build/html/index.html
index 93a710c17f3a80e7d711bc9e22e5d1cba45a9b6c..205714867bba948a44e81ba892bb8b64fb6d6a20 100644
--- a/sphinx/build/html/index.html
+++ b/sphinx/build/html/index.html
@@ -221,11 +221,7 @@
<li class="toctree-l2"><a class="reference internal" href="V2_00.html#the-philosophy-of-ohmpi">The philosophy of Ohmpi</a></li>
<li class="toctree-l2"><a class="reference internal" href="V2_00.html#technical-data">Technical data</a></li>
<li class="toctree-l2"><a class="reference internal" href="V2_00.html#step-n1-raspberry-pi-configuration"><strong>STEP n°1</strong> : Raspberry Pi configuration</a></li>
-<li class="toctree-l2"><a class="reference internal" href="V2_00.html#assembly-of-the-measuring-current-injection-cards-and-connection-with-the-raspberry-pi">Assembly of the measuring/current injection cards, and connection with the Raspberry Pi</a></li>
-<li class="toctree-l2"><a class="reference internal" href="V2_00.html#multiplexer-implentation">Multiplexer implentation</a></li>
-<li class="toctree-l2"><a class="reference internal" href="V2_00.html#electrode-connection">Electrode connection</a></li>
-<li class="toctree-l2"><a class="reference internal" href="V2_00.html#operating-instruction">Operating instruction</a></li>
-<li class="toctree-l2"><a class="reference internal" href="V2_00.html#complete-list-of-components">Complete list of components</a></li>
+<li class="toctree-l2"><a class="reference internal" href="V2_00.html#step-n2-assembly-of-the-measurement-board"><strong>STEP n°2</strong>: Assembly of the measurement board</a></li>
</ul>
</li>
</ul>
diff --git a/sphinx/build/html/searchindex.js b/sphinx/build/html/searchindex.js
index cbd93c057972e746d171e1cf525d3059accd03cd..9d6839628f172706742555c263ab6283721ba356 100644
--- a/sphinx/build/html/searchindex.js
+++ b/sphinx/build/html/searchindex.js
@@ -1 +1 @@
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diff --git a/sphinx/source/V2_00.rst b/sphinx/source/V2_00.rst
index 5cffe76fe42144dafa816bb388dd2314b5826890..6a511baef4a0479a24a3b106c5fa23f41975688d 100644
--- a/sphinx/source/V2_00.rst
+++ b/sphinx/source/V2_00.rst
@@ -237,340 +237,73 @@ If you decided to use a virtual environment, it is necessary to setup Thonny Pyt
9- Close thonny to save modifications
-Assembly of the measuring/current injection cards, and connection with the Raspberry Pi
-*****************************************************************************************
+**STEP n°2**: Assembly of the measurement board
+****************************************************
-Electrical resistivity measurements board
-==========================================
++----------------------------------------------------+
+| **Required components** |
++----------------------------------------------------+
-a) Description
------------------------------
-
-To measure electrical resistivity with Raspberry Pi, an ADS1115 was introduced, as proposed by Florsch [7]. The ADS1115
-is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. Its value has been set at 2/3 in this study. The
-input signal value could lie between - to + 6.114 V. The ADS1115 is mounted on a board adapted from an in-house design.
-Figure 5 shows the general diagram for the electronic measurement board developed. This figure also displays the test
-circuit used to test the board in the laboratory, which mimics the behavior of a soil subjected to current injection.
-In this test circuit, resistance R11 represents the soil resistance.
-Soil resistance R11 is connected to electrodes A and B for the current injection. Resistors R10 and R12 constitute
-the contact resistances between soil and electrodes; they are typically made of stainless steel. The battery, which
-allows for direct current injection, is connected in series with resistors R10, R11 and R12. In this part of the board,
-resistance R9 has been added to measure the current flowing between electrodes A and B. This resistance value has been
-set at 50 ohms in order to ensure:
-• a precise resistance,
-• a resistance less than the sum of resistors R10, R11 and R12; indeed, R10 and R12 generally lie between 100 and 5,000 ohms.
-To measure the current intensity between A and B, the electrical potential difference at the pole of the reference resistor (R9)
-is measured. The intensity (in mA) is calculated by inserting the resulting value into the following: ?
-To measure the potential difference needed to measure current intensity, the ADS 1115 is connected to the ground of the circuit.
-In our case, the ground reference is electrode B. The analog inputs A1 and A0 of the ADS1115 are connected to each pole of the
-reference resistor (R9). In order to increase input impedance and adapt the signal gain, tracking amplifiers have been included
-and completed by a divider bridge (R5, R8, R6 and R7) located between the two amplifiers. The resistance of the divider bridge
-ensures that the signal remains between 0 and 5 V, in accordance with the ADS1115 signal gain. To measure the potential difference,
-the M and N electrodes are connected to analog inputs A2 and A3 of the ADS 1115. Between the ADC and the electrodes, two tracking
-amplifiers and a divider bridge have been positioned so as to obtain a potential lying within the 0-5 V range at the analog input of the ADS 1115.
-Let's note that the potential difference value would equal the potential measured with ADS1115 multiplied by the voltage reduction
-value of the divider bridge (see Section 5.2). Despite the use of high-resolution resistance (i.e. accurate to within 1%), it is
-still necessary to calibrate the divider bridge using a precision voltmeter. For this purpose, the input and output potentials
-of the divider bridge must be measured using an equivalent circuit for various electrical potential values. These values serve
-to calculate the gain. With this electronic board, it is possible to measure the potential and intensity without disturbing the
-electric field in the ground, with the total input impedance value being estimated at 36 mega-ohms.
-A shortcut between Electrodes A and B will generate excessive currents, whose intensities depend on the type of battery used.
-A lithium ion battery or automobile-type lead-acid battery can deliver a strong enough current to damage the board and, as such,
-constitutes a potential hazard. We therefore recommend adding a 1.5-A fuse between the battery and resistor R9.
-In version 1.02, we have improved the electronic board of measurement. we have added a DC/DC converter to supply the operational amplifiers
-(2 Traco power DC/DCconverter TRN3-1215). These converters allow to limit the suppression of the signal when the injected voltage is higher than 10V.
-We also added 4 capacitors on the +12v inputs of the fast operational amplifiers. These are decoupling capacitors (typically 100nF ceramic)
-between each power supply terminal and ground. The last point, we have added a four very high resistances of 10 MOhm, between the ground and
-the signal input on the operational amplifiers. This prevents the operational amplifiers from overheating.
-
-.. figure:: schema_measurement_board1_02.png
- :width: 800px
- :align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Measurement board (Ohmpi version 1.02)
-
-.. note::
- If you want to have very accurate measurements you can replace the resistors with a tolerance of 1% by resistors with a tolerance of 0.01% which will improve the measurement, but the cost will be higher.
-
-
-
-b) Implementation
---------------------------------
-The measurement board must be printed using the PCB file (Source file repository), with components soldered onto
-it by following the steps described below and illustrated in the following figure :
-
-* Step no. 1: test divider bridge
- For each measurement channel, we have installed a bridge divider, it is necessary to test with ohmmeter the value of the resistances, to adjust each coefficients (coef_p0, coef_p1, coef_p2, coef_p3) in the Ohmpi.py code..
-
- .. math::
- coeff po = (R1 + R2) / R1
-
- .. math::
- coeff p1 = (R3 + R4) / R3
-
- .. math::
- coeff p2 = (R7 + R6) / R7
-
- .. math::
- coeff p3 = (R9 + R8) / R9
-
- .. code-block:: python
- :linenos:
- :lineno-start: 36
-
- """
- hardware parameters
- """
- R_ref = 50 # reference resistance value in ohm
- coef_p0 = 2.5 # slope for current conversion for ADS.P0, measurement in V/V
- coef_p1 = 2.5 # slope for current conversion for ADS.P1, measurement in V/V
- coef_p2 = 2.5 # slope for current conversion for ADS.P2, measurement in V/V
- coef_p3 = 2.5 # slope for current conversion for ADS.P3, measurement in V/V
-
- The coefficient parameters can be adjusted in lines 40 to 43 of the ohmpi.py code.
-
-
-* Step no. 2: installation of the 1-Kohm resistors with an accuracy of ± 1% (b-in the figure).
-* Step no. 3: installation of the 1.5-Kohm resistors with an accuracy of ± 1%(C-in the figure).
-* Step no. 4: installation of both the black female 1 x 10 header and the 7-blue screw terminal blocks (c-in the figure)
-* Step no. 5: installation of the 50-Ohm reference resistor ± 0.1%, please check the value and correct the line 39 in ohmpi.py code (d-in the figure)
-* Step no. 6: addition of both the ADS115 directly onto the header (pins must be plugged according to the figure) and the LM358N operational amplifiers (pay attention to the orientation) (e-in the figure).
-* Step no. 7: installation of the 10-Mohm resistors with an accuracy of ± 5% (f-in the figure).
-* Step no. 8: installation of the two DC/DC converter TRN3-1215 (h-in the figure).
-* Setp no. 9: installation of the four capacitor on 100-nF/50vDC and the fuse of 10-A (h-in the figure).
-
-1-Kohm and 1.5-Kohm resistors apply to the divider bridge. If, for example, you prefer using a stronger power supply, it would be possible to adjust the divider bridge value by simply modifying these resistors.
-Once all the components have been soldered together, the measurement board can be connected to the Raspberry Pi and the
-battery terminal, according to Figure 9. Between the battery and the TX+ terminal of the measurement board, remember to
-place a fuse holder with a 1.5-A fuse for safety purposes.
-
-.. figure:: measurement_board1-02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Measurement circuit board assembly: a) printed circuit board, b) adding the 1-Kohm resistors ± 1%, c)adding the 1.5-Kohm resistors ± 1%, d) adding the black female 1 x 10 header and the 7-blue screw terminal block(2 pin, 3.5-mm pitch), e) adding the 50-ohm reference resistor ± 0.1%, and f) adding the ADS1115 and the LM358N low-power dual operational amplifiers
-
-.. figure:: measurement_board-2-V1-02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Measurement board installation with Raspberry Pi
-
-Current injection board
-=======================
-
-To carry out the electrical resistivity measurement, the first step consists of injecting current into the ground.
-In our case, a simple 9-V lead-acid battery is used to create an electrical potential difference that results
-in current circulating into the ground. The current is injected through electrodes A and B (see Fig. 2). This
-injection is controlled via a 4-channel relay module board connected to the Raspberry Pi. The mechanical relay
-module board is shown in Figure 4. Relays 1 and 2 serve to switch on the current source. The common contacts
-of relays 1 and 2 are connected to the positive and negative battery poles, respectively. The normally open
-contacts of both relays are connected to the common contacts of relays 3 and 4. Relays 1 and 2 are connected
-to the GPIO 7 on the Raspberry Pi and therefore activate simultaneously. The role of relays 3 and 4 is to reverse
-the polarity at electrodes A and B. Thus, when relays 3 and 4 are energized by the GPIO 8 in the open position,
-the positive battery pole is connected to electrode A and the negative pole to electrode B. When not energized,
-they remain in the normally closed position. This set-up offers a simple and robust solution to inject current.
-
-.. figure:: current_board.jpg
- :width: 800px
- :align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Wiring of the 4-channel relay module board for current injection management
-
-The next step consists of featuring the 4-channel relay module used for current injection and its assembly. The wiring
-between the relays must be carried out in strict accordance with Fig. 10. This card must then be connected to the Raspberry
-Pi and the measurement card. On the Raspberry Pi, it is necessary to connect inputs In1 and In2 to the same GPIO. For this
-purpose, it is necessary to solder together the two pins on the 4-channel relay shield module and connect them to the Raspberry Pi GPIO-7 (Fig. 10). The same must be performed for inputs In3 and In4 with GPIO-8. Connect the GND and 5Vdc pins of
-the relay card’s 4 channels respectively to the GND pin and 5Vcc of the Raspberry Pi. Now connect relays 1, 2, 3 and 4, as
-shown in the diagram, using 1-mm2 cables (red and black in Fig. 10). Lastly, connect the inputs of relay 1 and 2 respectively
-to terminals B and A of the measurement board.
-
-.. figure:: installation_current_board_1_02.jpg
- :width: 800px
- :align: center
- :height: 700px
- :alt: alternate text
- :figclass: align-center
-
- Current injection board installation with Raspberry Pi
-
-
-Congratulations, you have build a 4 electrodes resistivity-meter.
+.. figure:: mesure/00_mes_board_components.jpg
+ :width: 600px
+ :align: center
+ :height: 450px
+ :alt: alternate text
+ :figclass: align-center
-Frist four electrodes resistivity mesurement
-============================================
+Description
+==========================================
-Under construction !
+.. figure:: schema_measurement_board.jpg
+ :width: 600px
+ :align: center
+ :height: 450px
+ :alt: alternate text
+ :figclass: align-center
-Describe the way to valide the first part of the instruction.
-Electrical resistivity measurement on test circuit
+Figure shows the general diagram for the electronic measurement board developed.
+We have developed a complete measurement board. To measure electrical resistivity with Raspberry Pi, two ADS1115 were used,one for the voltage measurement one for the current measurement, as proposed by Florsch [7]. The ADS1115
+is a 16-bit ADC (Analog-to-Digital Converter), with an adaptable gain. The advantage of ADS1115 is that the
+input signal value could lie between - to + 6.114 V. Pour la mesure du current nous avons intégré directement le composant ina282, qui permet de réaliser des mesure de courant de précision autour d'une resistance de shunt
-
-Multiplexer implentation
-*************************
-The resistivity measurement is conducted on four terminals (A, B, M and N). The user could perform each measurement
-by manually plugging four electrodes into the four channel terminals. In practice, ERT requires several tens or thousands
-of measurements conducted on different electrode arrays. A multiplexer is therefore used to connect each channel to one of
-the 32 electrodes stuck into the ground, all of which are connected to the data logger.
-
-
-We will describe below how to assemble the four multiplexers (MUX), one per terminal. A multiplexer consists of 2 relay
-modules with 16 channels each. On the first board, on each MUX, 15 relays out of the 16 available will be used. Please note that the suggested
-configuration enables making smaller multiplexers (8 or 16 electrodes only). On the other hand, if you prefer upping to 64 electrodes,
-which is entirely possible, a GPIO channel multiplier will have to be used.
-To prepare the multiplexer, the channels of the two relay boards must be connected according to the wiring diagram shown below.
-
-.. figure:: multiplexer_implementation.jpg
- :width: 800px
+.. table::
:align: center
- :height: 500px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/01_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Schematic diagram of the wiring of two 16-channel relay shields
-
-
-For this purpose, 0.5-mm² cables with end caps are used and their length adjusted for each connection in order to produce a clean assembly.
-The length was adjusted so that the distance between the two points to be connected could be directly measured on the board once they had
-been assembled one above the other, in adding an extra 3 cm. The wires at the ends need to be stripped and the end caps added.
-As a final step, connect the cables to the correct connectors. This operation must be repeated in order to carry out all the wiring shown in Figure below.
-
-Once the operation has been completed, the 16 control pins of each 16-channel relay shield card must be prepared. Each card actually contains 16 input channels
-for activating each relay (Fig. 12). However, we will be activating several relays with a single GPIO (to limit the number of GPIOs used on Raspberry Pi,
-see Section 2.4). To execute this step, it will be necessary to follow the protocol presented in Figure.
-
- .. figure:: connection.jpg
- :width: 800px
+.. table::
:align: center
- :height: 400px
- :alt: alternate text
- :figclass: align-center
-
- Connection to the 16-channel relay shield
-
-For the 16-channel relay shield no. 1, these steps must be followed:
-* Position a test circuit with 10 horizontal and 10 vertical holes on the pins of the 16-channel relay shield board.
-* Follow the diagram and solder the pins as shown in Fig.
-* Lastly, solder 0.5-mm² wires 1 m in length to the test circuit.
-
-For relay shield no. 2, follow the same procedure, but solder all the pins together (d-e-f).
-This same operation must be repeated for the other three multiplexers as well.
-The next step consists of connecting the relay card inputs to the Raspberry Pi according to Table 5 for all four multiplexers.
-
-
-+-------------------------------+-------------------------------------------+---------------------+
-| |Relay shield n°1 |Relay Shield n°2 |
-| +----------+----------+----------+----------+---------------------+
-| |Pin 1 |Pin 2-3 |Pin 4-7 |Pin 8-16 |Pin 1- 16 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer A |12 |16 |20 |21 |26 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer B |18 |23 |24 |25 |19 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer M |06 |13 |04 |17 |27 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-| Multiplexer N |22 |10 |09 |11 |05 |
-+-------------------------------+----------+----------+----------+----------+---------------------+
-
- Connection of the GPIOs to each multiplexer
-
-
-Electrode connection
-*************************
-At this point, all that remains is to connect the electrodes of each multiplexer to a terminal block (Fig. 13). In our set-up, screw terminals assembled on a din rail were used.
-According to the chosen multiplexer configuration, all the relays of each multiplexer will be connected to an electrode and, consequently, each electrode will have four incoming
-connections. Instead of having four cables connecting an electrode terminal to each multiplexer, we recommend using the cable assembly shown in the following Figure.
-
-.. figure:: cable.jpg
- :width: 800px
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/02_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
+.. table::
:align: center
- :height: 300px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/03_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Wire cabling for multiplexer and terminal screw connection
-
-the next figure provides an example of multiplexer relay connections for electrode no. 1: this electrode of multiplexer MUX A must be connected to electrode no. 1 of MUX B. Moreover, electrode no. 1 of MUX B
-must be connected to electrode no. 1 of MUX N, which in turn must be connected to electrode no. 1 of MUX M. Lastly, electrode no. 1 of MUX M is connected to the terminal block.
-This operation must be repeated for all 32 electrodes.
-
-.. figure:: electrode_cable.jpg
- :width: 800px
+.. table::
+ :align: center
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/04_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
+.. table::
:align: center
- :height: 800px
- :alt: alternate text
- :figclass: align-center
+
+ +---------------------------------------+---------------------------------------+
+ | .. image:: mesure/05_mes_board.jpg | |
+ +---------------------------------------+---------------------------------------+
- Example of a multiplexer connection to the screw terminal for electrode no. 1.
-
-.. warning::
- The 16 channel relay cards exist in 5-V and 12-V , in the bottom figure we have 12-V cards that we will directly connect to the battery.
- In case you bought 16 channel relay 5-V cards, you will need to add a DC/DC 12-V/5-V converter. You can use a STEP DOWN MODULE DC-DC (Velleman WPM404) and set the voltage to 5V with the potentiometer.
-
-Operating instruction
-*************************
-
-Preliminary procedure (Only for the initial operation)
-======================================================
-The open source code must be downloaded at the Open Science Framework source file repository for this manuscript (https://osf.io/dzwb4/)
-or at the following Gitlab repository address: https://gitlab.irstea.fr/reversaal/OhmPi. The code must be then unzipped into a selected folder (e.g. OhmPi-master). A “readme†file
-is proposed in the directory to assist with installation of the software and required python packages. It is strongly recommended to create a python virtual environment for installing
-the required packages and running the code.
-
-
-Startup procedure
-==================
-As an initial operating instruction, all batteries must be disconnected before any hardware handling. Ensure that the battery is charged at full capacity. Plug all the electrodes (32 or fewer)
-into the screw terminals. The Raspberry Pi must be plugged into a computer screen, with a mouse and keyboard accessed remotely. The Raspberry Pi must then be plugged into the power supply
-(for laboratory measurements) or a power bank (5V - 2A for field measurements). At this point, you'll need to access the Raspbian operating system. Inside the previously created folder “ohmPiâ€,
-the protocol file “ABMN.txt†must be created or modified; this file contains all quadrupole ABMN numeration (an example is proposed with the source code). Some input parameters of the main “ohmpi.pyâ€
-function may be adjusted/optimized depending on the measurement attributes. For example, both the current injection duration and number of stacks can be adjusted. At this point, the9 V and 12-V battery can be
-plugged into the hardware; the "ohmpi.py" source code must be run within a python3 environment (or a virtual environment if one has been created) either in the terminal or using Thonny. You should now
-hear the characteristic sound of a relay switching as a result of electrode permutation. After each quadrupole measurement, the potential difference as well as the current intensity and resistance
-are displayed on the screen. A measurement file is automatically created and named "measure.csv"; it will be placed in the same folder.
-
-Electrical resistivity measurement parameters description
-==========================================================
-
-In the version 1.02, the measurement parameters are in the Jason file (ohmpi_param.json).
-
-.. code-block:: python
- :linenos:
- :lineno-start: 1
-
-
- nb_electrodes = 32 # maximum number of electrodes on the resistivity meter
- injection_duration = 0.5 # Current injection duration in second
- nbr_meas= 1 # Number of times the quadripole sequence is repeated
- sequence_delay= 30 # Delay in seconds between 2 sequences
- stack= 1 # repetition of the current injection for each quadripole
- export_path= "home/pi/Desktop/measurement.csv"
-
-
-
-Complete list of components
-*******************************
-.. warning::
- The list evolve a little bit after the publication of the article, it is necessary to refer to this list, the article is out of date
-
-
-.. csv-table:: List of components
- :file: C:\Users\remi.clement\Documents\28_ohmpi_all_git\master\sphinx\source\list - 1_02.csv
- :widths: 30, 70, 70, 70, 70,70
- :header-rows: 1
-
-
+.. table::
+ :align: center
+
+ +---------------------------------------+---------------------------------------+
+ | | .. image:: mesure/06_mes_board.jpg |
+ +---------------------------------------+---------------------------------------+
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+ In this part of the board, resistance R9 has been added to measure the current flowing between electrodes A and B. This resistance value has been
+set at 2 ohms in order to ensure:
+• a precise resistance,
+• a resistance less than the sum of resistors R10, R11 and R12; indeed, R10 and R12 generally lie between 100 and 5,000 ohms.
+To measure the current intensity between A and B, the electrical potential difference at the pole of the reference resistor (R9)
+is measured. The intensity (in mA) is calculated by inserting the resulting value into the following:
+
+
+To measure the potential difference needed to measure current intensity, the ADS 1115 is connected to the ground of the circuit.
+In our case, the ground reference is electrode B. The analog inputs A1 and A0 of the ADS1115 are connected to each pole of the
+reference resistor (R9). In order to increase input impedance and adapt the signal gain, tracking amplifiers have been included
+and completed by a divider bridge (R5, R8, R6 and R7) located between the two amplifiers. The resistance of the divider bridge
+ensures that the signal remains between 0 and 5 V, in accordance with the ADS1115 signal gain. To measure the potential difference,
+the M and N electrodes are connected to analog inputs A2 and A3 of the ADS 1115. Between the ADC and the electrodes, two tracking
+amplifiers and a divider bridge have been positioned so as to obtain a potential lying within the 0-5 V range at the analog input of the ADS 1115.
+Let's note that the potential difference value would equal the potential measured with ADS1115 multiplied by the voltage reduction
+value of the divider bridge (see Section 5.2). Despite the use of high-resolution resistance (i.e. accurate to within 1%), it is
+still necessary to calibrate the divider bridge using a precision voltmeter. For this purpose, the input and output potentials
+of the divider bridge must be measured using an equivalent circuit for various electrical potential values. These values serve
+to calculate the gain. With this electronic board, it is possible to measure the potential and intensity without disturbing the
+electric field in the ground, with the total input impedance value being estimated at 36 mega-ohms.
+A shortcut between Electrodes A and B will generate excessive currents, whose intensities depend on the type of battery used.
+A lithium ion battery or automobile-type lead-acid battery can deliver a strong enough current to damage the board and, as such,
+constitutes a potential hazard. We therefore recommend adding a 1.5-A fuse between the battery and resistor R9.
+In version 1.02, we have improved the electronic board of measurement. we have added a DC/DC converter to supply the operational amplifiers
+(2 Traco power DC/DCconverter TRN3-1215). These converters allow to limit the suppression of the signal when the injected voltage is higher than 10V.
+We also added 4 capacitors on the +12v inputs of the fast operational amplifiers. These are decoupling capacitors (typically 100nF ceramic)
+between each power supply terminal and ground. The last point, we have added a four very high resistances of 10 MOhm, between the ground and
+the signal input on the operational amplifiers. This prevents the operational amplifiers from overheating.
+
+.. figure:: schema_measurement_board.jpg
+ :width: 800px
+ :align: center
+ :height: 400px
+ :alt: alternate text
+ :figclass: align-center
+
+ Measurement board (Ohmpi version 1.02)
+
+.. note::
+ If you want to have very accurate measurements you can replace the resistors with a tolerance of 1% by resistors with a tolerance of 0.01% which will improve the measurement, but the cost will be higher.
+
+
+
+b) Implementation
+--------------------------------
+The measurement board must be printed using the PCB file (Source file repository), with components soldered onto
+it by following the steps described below and illustrated in the following figure :
+
+* Step no. 1: test divider bridge
+ For each measurement channel, we have installed a bridge divider, it is necessary to test with ohmmeter the value of the resistances, to adjust each coefficients (coef_p0, coef_p1, coef_p2, coef_p3) in the Ohmpi.py code..
+
+ .. math::
+ coeff po = (R1 + R2) / R1
+
+ .. math::
+ coeff p1 = (R3 + R4) / R3
+
+ .. math::
+ coeff p2 = (R7 + R6) / R7
+
+ .. math::
+ coeff p3 = (R9 + R8) / R9
+
+ .. code-block:: python
+ :linenos:
+ :lineno-start: 36
+
+ """
+ hardware parameters
+ """
+ R_ref = 50 # reference resistance value in ohm
+ coef_p0 = 2.5 # slope for current conversion for ADS.P0, measurement in V/V
+ coef_p1 = 2.5 # slope for current conversion for ADS.P1, measurement in V/V
+ coef_p2 = 2.5 # slope for current conversion for ADS.P2, measurement in V/V
+ coef_p3 = 2.5 # slope for current conversion for ADS.P3, measurement in V/V
+
+ The coefficient parameters can be adjusted in lines 40 to 43 of the ohmpi.py code.
+
+
+* Step no. 2: installation of the 1-Kohm resistors with an accuracy of ± 1% (b-in the figure).
+* Step no. 3: installation of the 1.5-Kohm resistors with an accuracy of ± 1%(C-in the figure).
+* Step no. 4: installation of both the black female 1 x 10 header and the 7-blue screw terminal blocks (c-in the figure)
+* Step no. 5: installation of the 50-Ohm reference resistor ± 0.1%, please check the value and correct the line 39 in ohmpi.py code (d-in the figure)
+* Step no. 6: addition of both the ADS115 directly onto the header (pins must be plugged according to the figure) and the LM358N operational amplifiers (pay attention to the orientation) (e-in the figure).
+* Step no. 7: installation of the 10-Mohm resistors with an accuracy of ± 5% (f-in the figure).
+* Step no. 8: installation of the two DC/DC converter TRN3-1215 (h-in the figure).
+* Setp no. 9: installation of the four capacitor on 100-nF/50vDC and the fuse of 10-A (h-in the figure).
+
+1-Kohm and 1.5-Kohm resistors apply to the divider bridge. If, for example, you prefer using a stronger power supply, it would be possible to adjust the divider bridge value by simply modifying these resistors.
+Once all the components have been soldered together, the measurement board can be connected to the Raspberry Pi and the
+battery terminal, according to Figure 9. Between the battery and the TX+ terminal of the measurement board, remember to
+place a fuse holder with a 1.5-A fuse for safety purposes.
+
+.. figure:: measurement_board1-02.jpg
+ :width: 800px
+ :align: center
+ :height: 700px
+ :alt: alternate text
+ :figclass: align-center
+
+ Measurement circuit board assembly: a) printed circuit board, b) adding the 1-Kohm resistors ± 1%, c)adding the 1.5-Kohm resistors ± 1%, d) adding the black female 1 x 10 header and the 7-blue screw terminal block(2 pin, 3.5-mm pitch), e) adding the 50-ohm reference resistor ± 0.1%, and f) adding the ADS1115 and the LM358N low-power dual operational amplifiers
+
+.. figure:: measurement_board-2-V1-02.jpg
+ :width: 800px
+ :align: center
+ :height: 700px
+ :alt: alternate text
+ :figclass: align-center
+
+ Measurement board installation with Raspberry Pi
+
+
+
+
+
+
+Current injection board
+=======================
+
+To carry out the electrical resistivity measurement, the first step consists of injecting current into the ground.
+In our case, a simple 9-V lead-acid battery is used to create an electrical potential difference that results
+in current circulating into the ground. The current is injected through electrodes A and B (see Fig. 2). This
+injection is controlled via a 4-channel relay module board connected to the Raspberry Pi. The mechanical relay
+module board is shown in Figure 4. Relays 1 and 2 serve to switch on the current source. The common contacts
+of relays 1 and 2 are connected to the positive and negative battery poles, respectively. The normally open
+contacts of both relays are connected to the common contacts of relays 3 and 4. Relays 1 and 2 are connected
+to the GPIO 7 on the Raspberry Pi and therefore activate simultaneously. The role of relays 3 and 4 is to reverse
+the polarity at electrodes A and B. Thus, when relays 3 and 4 are energized by the GPIO 8 in the open position,
+the positive battery pole is connected to electrode A and the negative pole to electrode B. When not energized,
+they remain in the normally closed position. This set-up offers a simple and robust solution to inject current.
+
+.. figure:: current_board.jpg
+ :width: 800px
+ :align: center
+ :height: 400px
+ :alt: alternate text
+ :figclass: align-center
+
+ Wiring of the 4-channel relay module board for current injection management
+
+The next step consists of featuring the 4-channel relay module used for current injection and its assembly. The wiring
+between the relays must be carried out in strict accordance with Fig. 10. This card must then be connected to the Raspberry
+Pi and the measurement card. On the Raspberry Pi, it is necessary to connect inputs In1 and In2 to the same GPIO. For this
+purpose, it is necessary to solder together the two pins on the 4-channel relay shield module and connect them to the Raspberry Pi GPIO-7 (Fig. 10). The same must be performed for inputs In3 and In4 with GPIO-8. Connect the GND and 5Vdc pins of
+the relay card’s 4 channels respectively to the GND pin and 5Vcc of the Raspberry Pi. Now connect relays 1, 2, 3 and 4, as
+shown in the diagram, using 1-mm2 cables (red and black in Fig. 10). Lastly, connect the inputs of relay 1 and 2 respectively
+to terminals B and A of the measurement board.
+
+.. figure:: installation_current_board_1_02.jpg
+ :width: 800px
+ :align: center
+ :height: 700px
+ :alt: alternate text
+ :figclass: align-center
+
+ Current injection board installation with Raspberry Pi
+
+
+Congratulations, you have build a 4 electrodes resistivity-meter.
+
+
+Frist four electrodes resistivity mesurement
+============================================
+
+
+Under construction !
+
+Describe the way to valide the first part of the instruction.
+Electrical resistivity measurement on test circuit
+
+
+Multiplexer implentation
+*************************
+The resistivity measurement is conducted on four terminals (A, B, M and N). The user could perform each measurement
+by manually plugging four electrodes into the four channel terminals. In practice, ERT requires several tens or thousands
+of measurements conducted on different electrode arrays. A multiplexer is therefore used to connect each channel to one of
+the 32 electrodes stuck into the ground, all of which are connected to the data logger.
+
+
+We will describe below how to assemble the four multiplexers (MUX), one per terminal. A multiplexer consists of 2 relay
+modules with 16 channels each. On the first board, on each MUX, 15 relays out of the 16 available will be used. Please note that the suggested
+configuration enables making smaller multiplexers (8 or 16 electrodes only). On the other hand, if you prefer upping to 64 electrodes,
+which is entirely possible, a GPIO channel multiplier will have to be used.
+To prepare the multiplexer, the channels of the two relay boards must be connected according to the wiring diagram shown below.
+
+.. figure:: multiplexer_implementation.jpg
+ :width: 800px
+ :align: center
+ :height: 500px
+ :alt: alternate text
+ :figclass: align-center
+
+ Schematic diagram of the wiring of two 16-channel relay shields
+
+
+For this purpose, 0.5-mm² cables with end caps are used and their length adjusted for each connection in order to produce a clean assembly.
+The length was adjusted so that the distance between the two points to be connected could be directly measured on the board once they had
+been assembled one above the other, in adding an extra 3 cm. The wires at the ends need to be stripped and the end caps added.
+As a final step, connect the cables to the correct connectors. This operation must be repeated in order to carry out all the wiring shown in Figure below.
+
+Once the operation has been completed, the 16 control pins of each 16-channel relay shield card must be prepared. Each card actually contains 16 input channels
+for activating each relay (Fig. 12). However, we will be activating several relays with a single GPIO (to limit the number of GPIOs used on Raspberry Pi,
+see Section 2.4). To execute this step, it will be necessary to follow the protocol presented in Figure.
+
+ .. figure:: connection.jpg
+ :width: 800px
+ :align: center
+ :height: 400px
+ :alt: alternate text
+ :figclass: align-center
+
+ Connection to the 16-channel relay shield
+
+For the 16-channel relay shield no. 1, these steps must be followed:
+* Position a test circuit with 10 horizontal and 10 vertical holes on the pins of the 16-channel relay shield board.
+* Follow the diagram and solder the pins as shown in Fig.
+* Lastly, solder 0.5-mm² wires 1 m in length to the test circuit.
+
+For relay shield no. 2, follow the same procedure, but solder all the pins together (d-e-f).
+This same operation must be repeated for the other three multiplexers as well.
+The next step consists of connecting the relay card inputs to the Raspberry Pi according to Table 5 for all four multiplexers.
+
+
++-------------------------------+-------------------------------------------+---------------------+
+| |Relay shield n°1 |Relay Shield n°2 |
+| +----------+----------+----------+----------+---------------------+
+| |Pin 1 |Pin 2-3 |Pin 4-7 |Pin 8-16 |Pin 1- 16 |
++-------------------------------+----------+----------+----------+----------+---------------------+
+| Multiplexer A |12 |16 |20 |21 |26 |
++-------------------------------+----------+----------+----------+----------+---------------------+
+| Multiplexer B |18 |23 |24 |25 |19 |
++-------------------------------+----------+----------+----------+----------+---------------------+
+| Multiplexer M |06 |13 |04 |17 |27 |
++-------------------------------+----------+----------+----------+----------+---------------------+
+| Multiplexer N |22 |10 |09 |11 |05 |
++-------------------------------+----------+----------+----------+----------+---------------------+
+
+ Connection of the GPIOs to each multiplexer
+
+
+Electrode connection
+*************************
+At this point, all that remains is to connect the electrodes of each multiplexer to a terminal block (Fig. 13). In our set-up, screw terminals assembled on a din rail were used.
+According to the chosen multiplexer configuration, all the relays of each multiplexer will be connected to an electrode and, consequently, each electrode will have four incoming
+connections. Instead of having four cables connecting an electrode terminal to each multiplexer, we recommend using the cable assembly shown in the following Figure.
+
+.. figure:: cable.jpg
+ :width: 800px
+ :align: center
+ :height: 300px
+ :alt: alternate text
+ :figclass: align-center
+
+ Wire cabling for multiplexer and terminal screw connection
+
+the next figure provides an example of multiplexer relay connections for electrode no. 1: this electrode of multiplexer MUX A must be connected to electrode no. 1 of MUX B. Moreover, electrode no. 1 of MUX B
+must be connected to electrode no. 1 of MUX N, which in turn must be connected to electrode no. 1 of MUX M. Lastly, electrode no. 1 of MUX M is connected to the terminal block.
+This operation must be repeated for all 32 electrodes.
+
+.. figure:: electrode_cable.jpg
+ :width: 800px
+ :align: center
+ :height: 800px
+ :alt: alternate text
+ :figclass: align-center
+
+ Example of a multiplexer connection to the screw terminal for electrode no. 1.
+
+.. warning::
+ The 16 channel relay cards exist in 5-V and 12-V , in the bottom figure we have 12-V cards that we will directly connect to the battery.
+ In case you bought 16 channel relay 5-V cards, you will need to add a DC/DC 12-V/5-V converter. You can use a STEP DOWN MODULE DC-DC (Velleman WPM404) and set the voltage to 5V with the potentiometer.
+
+Operating instruction
+*************************
+
+Preliminary procedure (Only for the initial operation)
+======================================================
+The open source code must be downloaded at the Open Science Framework source file repository for this manuscript (https://osf.io/dzwb4/)
+or at the following Gitlab repository address: https://gitlab.irstea.fr/reversaal/OhmPi. The code must be then unzipped into a selected folder (e.g. OhmPi-master). A “readme†file
+is proposed in the directory to assist with installation of the software and required python packages. It is strongly recommended to create a python virtual environment for installing
+the required packages and running the code.
+
+
+Startup procedure
+==================
+As an initial operating instruction, all batteries must be disconnected before any hardware handling. Ensure that the battery is charged at full capacity. Plug all the electrodes (32 or fewer)
+into the screw terminals. The Raspberry Pi must be plugged into a computer screen, with a mouse and keyboard accessed remotely. The Raspberry Pi must then be plugged into the power supply
+(for laboratory measurements) or a power bank (5V - 2A for field measurements). At this point, you'll need to access the Raspbian operating system. Inside the previously created folder “ohmPiâ€,
+the protocol file “ABMN.txt†must be created or modified; this file contains all quadrupole ABMN numeration (an example is proposed with the source code). Some input parameters of the main “ohmpi.pyâ€
+function may be adjusted/optimized depending on the measurement attributes. For example, both the current injection duration and number of stacks can be adjusted. At this point, the9 V and 12-V battery can be
+plugged into the hardware; the "ohmpi.py" source code must be run within a python3 environment (or a virtual environment if one has been created) either in the terminal or using Thonny. You should now
+hear the characteristic sound of a relay switching as a result of electrode permutation. After each quadrupole measurement, the potential difference as well as the current intensity and resistance
+are displayed on the screen. A measurement file is automatically created and named "measure.csv"; it will be placed in the same folder.
+
+Electrical resistivity measurement parameters description
+==========================================================
+
+In the version 1.02, the measurement parameters are in the Jason file (ohmpi_param.json).
+
+.. code-block:: python
+ :linenos:
+ :lineno-start: 1
+
+
+ nb_electrodes = 32 # maximum number of electrodes on the resistivity meter
+ injection_duration = 0.5 # Current injection duration in second
+ nbr_meas= 1 # Number of times the quadripole sequence is repeated
+ sequence_delay= 30 # Delay in seconds between 2 sequences
+ stack= 1 # repetition of the current injection for each quadripole
+ export_path= "home/pi/Desktop/measurement.csv"
+
+
+
+Complete list of components
+*******************************
+.. warning::
+ The list evolve a little bit after the publication of the article, it is necessary to refer to this list, the article is out of date
+
+
+.. csv-table:: List of components
+ :file: C:\Users\remi.clement\Documents\28_ohmpi_all_git\master\sphinx\source\list - 1_02.csv
+ :widths: 30, 70, 70, 70, 70,70
+ :header-rows: 1
\ No newline at end of file
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