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<li class="toctree-l1"><a class="reference internal" href="Ohmpi.html">OhmPi project</a></li>
<li class="toctree-l1"><a class="reference internal" href="V1_01.html">OhmPi V 1.01 (limited to 32 electrodes)</a></li>
<li class="toctree-l1"><a class="reference internal" href="V1_02.html">OhmPi V 1.02 (limited to 32 electrodes)</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">OhmPi V 2.xx (64 or 128 électrodes)</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#the-philosophy-of-ohmpi">The philosophy of Ohmpi</a></li>
<li class="toctree-l2"><a class="reference internal" href="#technical-data">Technical data</a></li>
<li class="toctree-l2"><a class="reference internal" href="#step-n1-raspberry-pi-configuration"><strong>STEP n°1</strong> : Raspberry Pi configuration</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#os-installation">OS installation</a></li>
<li class="toctree-l3"><a class="reference internal" href="#virtual-environnement-and-packages">Virtual Environnement and packages</a></li>
<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="#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>
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<section id="ohmpi-v-2-xx-64-or-128-electrodes">
<h1>OhmPi V 2.xx (64 or 128 électrodes)<a class="headerlink" href="#ohmpi-v-2-xx-64-or-128-electrodes" title="Permalink to this headline">¶</a></h1>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/Under-Construction.png"><img alt="Ohmpi 2" src="_images/Under-Construction.png" style="width: 500px; height: 250px;" /></a>
</figure>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/image_ohmpi_2.jpg"><img alt="Ohmpi 2" src="_images/image_ohmpi_2.jpg" style="width: 800px; height: 600px;" /></a>
</figure>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>In this version, we have developed two new board types that allow the assembly of Ohmpi v2.00, a measurement board and a multiplexer board.
This new version is made up of:</p>
<ol class="arabic simple">
<li><p>A measurement board for four-point measurement</p></li>
<li><p>4 multiplexer cards</p></li>
<li><p>A box</p></li>
</ol>
</div>
<section id="the-philosophy-of-ohmpi">
<h2>The philosophy of Ohmpi<a class="headerlink" href="#the-philosophy-of-ohmpi" title="Permalink to this headline">¶</a></h2>
<p>The philosophy of Ohmpi V2.00 is to offer a new DIY multielectrode resistivity meter. It is a resistivity meter with 64 electrodes , which can be upgraded to 128 electrodes.
It is limited to low-current injection,but suitable for small laboratory experiments and small field time-lapse monitoring.
Ohmpi, is developed by a team that seeks to share all its experience and wishes to improve and offer a more and more robust tool to the community.Ohmpi V2.00 is a completely different version from the previous one.
We will stop the development on the previous version, to dedicate our efforts on this new version.</p>
</section>
<section id="technical-data">
<h2>Technical data<a class="headerlink" href="#technical-data" title="Permalink to this headline">¶</a></h2>
<table class="docutils align-default">
<colgroup>
<col style="width: 33%" />
<col style="width: 22%" />
<col style="width: 12%" />
<col style="width: 22%" />
<col style="width: 12%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><strong>Parameter</strong></p></td>
<td><dl class="simple">
<dt><strong>Specifications</strong></dt><dd><p><strong>V1</strong></p>
</dd>
211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280
</dl>
</td>
<td><p>Units</p></td>
<td><dl class="simple">
<dt><strong>Specifications</strong></dt><dd><p><strong>V2</strong></p>
</dd>
</dl>
</td>
<td><p>Units</p></td>
</tr>
<tr class="row-even"><td><p>Electrodes</p></td>
<td><p>32</p></td>
<td></td>
<td><p>64 to 128</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>Operating temperature</p></td>
<td><p>-0 to 50</p></td>
<td><p>°c</p></td>
<td><p>-25 to 50</p></td>
<td><p>°c</p></td>
</tr>
<tr class="row-even"><td><p>Power consumption of CPU and
control system</p></td>
<td><p>18.5</p></td>
<td><p>W</p></td>
<td><p>18.5</p></td>
<td><p>W</p></td>
</tr>
<tr class="row-odd"><td><p>Voltage injection</p></td>
<td><p>12</p></td>
<td><p>V</p></td>
<td><p>12</p></td>
<td><p>V</p></td>
</tr>
<tr class="row-even"><td><p>Battery</p></td>
<td><p>9</p></td>
<td><p>V</p></td>
<td><p>12</p></td>
<td><p>V</p></td>
</tr>
<tr class="row-odd"><td><p>Current</p></td>
<td><p>0 to 40</p></td>
<td><p>mA</p></td>
<td><p>0 to 40</p></td>
<td><p>mA</p></td>
</tr>
<tr class="row-even"><td><p>Min pulse duration</p></td>
<td><p>150</p></td>
<td><p>mS</p></td>
<td><p>150</p></td>
<td><p>mS</p></td>
</tr>
<tr class="row-odd"><td><p>Input impedance</p></td>
<td><p>80</p></td>
<td><p>Mohm</p></td>
<td><p>80</p></td>
<td><p>Mohm</p></td>
</tr>
<tr class="row-even"><td><p>Data storage</p></td>
<td><p>micro SD card</p></td>
<td></td>
<td><p>micro SD card</p></td>
<td></td>
</tr>
<tr class="row-odd"><td><p>Resolution</p></td>
<td><p>O.O1</p></td>
<td><p>ohm</p></td>
<td><p>O.O1</p></td>
<td><p>ohm</p></td>
281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350
</tr>
</tbody>
</table>
</section>
<section id="step-n1-raspberry-pi-configuration">
<h2><strong>STEP n°1</strong> : Raspberry Pi configuration<a class="headerlink" href="#step-n1-raspberry-pi-configuration" title="Permalink to this headline">¶</a></h2>
<section id="os-installation">
<h3>OS installation<a class="headerlink" href="#os-installation" title="Permalink to this headline">¶</a></h3>
<table class="docutils align-default">
<colgroup>
<col style="width: 78%" />
<col style="width: 22%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><strong>Required components</strong></p></td>
<td><p><strong>Quantity</strong></p></td>
</tr>
<tr class="row-even"><td><p>Raspberry Pi 4 Model B</p></td>
<td><p>1</p></td>
</tr>
<tr class="row-odd"><td><p>Micro SD 32 Go</p></td>
<td><p>1</p></td>
</tr>
<tr class="row-even"><td><p>HDMI Cable</p></td>
<td><p>1</p></td>
</tr>
<tr class="row-odd"><td><p>Computer mouse</p></td>
<td><p>1</p></td>
</tr>
<tr class="row-even"><td><p>Computer Keyboard</p></td>
<td><p>1</p></td>
</tr>
</tbody>
</table>
<p>The first step is to start up the Raspberry Pi board, including installation of an OS (operating system).
For this step, the installation instructions are well described on the Raspberry website</p>
<ol class="arabic simple">
<li><p>Watch the vidéo “how to set up your raspberry Pi” (<a class="reference external" href="https://www.youtube.com/watch?v=wjWZhV1v3Pk">https://www.youtube.com/watch?v=wjWZhV1v3Pk</a>)</p></li>
<li><p>The authors recommend installing the latest stable and complete version of Raspbian by using NOOBS (a simple-to-use operating system installer).</p></li>
<li><p>or you can visit this website : (<a class="reference external" href="https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up">https://projects.raspberrypi.org/en/projects/raspberry-pi-setting-up</a>)</p></li>
</ol>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>All the development tests were performed on Raspberry Pi 3 Model B, we used the following version of Raspbian:</p>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/raspbian_version.jpg"><img alt="alternate text" src="_images/raspbian_version.jpg" style="width: 800px; height: 400px;" /></a>
</figure>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Once the OS has been installed, <strong>1-wire, spi and GPIO remote option</strong> must be deactivated via the Raspbian GUI settings menu. Failure to carry out this task may cause damage to the relay shield cards during measurements.</p>
</div>
<p>3. When the relays are connected to the GPIO, make sure that all the GPIOs are in the low position when the raspberry starts up. If not, the relays will activate unexpectedly.
To ensure that the GPIOs are in Low position, you will need to modify the /boot/config.txt file.</p>
<blockquote>
<div><p>Run the terminal, and write</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">cd</span> <span class="o">/</span><span class="n">boot</span><span class="o">/</span>
</pre></div>
</div>
</div></blockquote>
<ol class="arabic simple" start="4">
<li><p>Open config.txt with GNU nano editor</p></li>
</ol>
<blockquote>
<div><div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">nano</span> <span class="n">config</span><span class="o">.</span><span class="n">txt</span>
</pre></div>
</div>
</div></blockquote>
<ol class="arabic simple" start="5">
<li><p>At the end of the file write :</p></li>
351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420
</ol>
<blockquote>
<div><div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">gpio</span><span class="o">=</span><span class="mi">8</span><span class="o">=</span><span class="n">op</span><span class="p">,</span><span class="n">dl</span>
<span class="n">gpio</span><span class="o">=</span><span class="mi">7</span><span class="o">=</span><span class="n">op</span><span class="p">,</span><span class="n">dl</span>
</pre></div>
</div>
</div></blockquote>
<ol class="arabic simple" start="6">
<li><p>Press Ctrl +O to save the modifications and press enter</p></li>
<li><p>Press Ctrl +x to escap and return to the terminal</p></li>
<li><p>Close the terminal</p></li>
</ol>
</section>
<section id="virtual-environnement-and-packages">
<h3>Virtual Environnement and packages<a class="headerlink" href="#virtual-environnement-and-packages" title="Permalink to this headline">¶</a></h3>
<p>A virtual environment is a way to have multiple, parallel instances of the Python interpreter, each with different package sets and different configurations.
Each virtual environment contains a discrete copy of the Python interpreter, including copies of its support utilities. It also protects your system in case of problems with the packages.</p>
<p>All dependencies are specified in requirements.txt</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>All instructions below should be typed in the terminal</p>
</div>
<p>It is first necessary to ensure that the libatlas-base-dev library is installed:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="n">libatlas</span><span class="o">-</span><span class="n">base</span><span class="o">-</span><span class="n">dev</span>
</pre></div>
</div>
<p>We strongly recommend users to create a virtual environment to run the code and installed all required dependencies. It can be done either in a directory gathering all virtual environments used on the computer or within the ohmpy directory.</p>
<p>Create the virtual environment:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">python3</span> <span class="o">-</span><span class="n">m</span> <span class="n">venv</span> <span class="n">ohmpy</span>
</pre></div>
</div>
<p>Activate it using the following command:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">source</span> <span class="n">ohmpy</span><span class="o">/</span><span class="nb">bin</span><span class="o">/</span><span class="n">activate</span>
</pre></div>
</div>
<p>Install packages within the virtual environment. Installing the following package should be sufficient to meet dependencies:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">pip</span> <span class="n">install</span> <span class="n">RPi</span><span class="o">.</span><span class="n">GPIO</span> <span class="n">adafruit</span><span class="o">-</span><span class="n">blinka</span> <span class="n">numpy</span> <span class="n">adafruit</span><span class="o">-</span><span class="n">circuitpython</span><span class="o">-</span><span class="n">ads1x15</span> <span class="n">pandas</span>
</pre></div>
</div>
<p>Check that requirements are met using</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">pip</span> <span class="nb">list</span>
</pre></div>
</div>
<p>You should run you code within the virtual environment
to leave the virtual environment simply type:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">deactivate</span>
</pre></div>
</div>
</section>
<section id="activate-virtual-environnement-on-thonny-python-ide-on-rapberry-pi">
<h3>Activate virtual environnement on Thonny (Python IDE) (on Rapberry Pi)<a class="headerlink" href="#activate-virtual-environnement-on-thonny-python-ide-on-rapberry-pi" title="Permalink to this headline">¶</a></h3>
<p>If you decided to use a virtual environment, it is necessary to setup Thonny Python IDE the first time you use it.</p>
<p>1- Run the Thonny Python IDE software, Click on raspebrry acces <strong>menu > programming> Thonny pythonIDE</strong></p>
<p>2- Thonny’s interface opens, Python runs on the Root (Python 3.7.3 (/usr/bin/python3))</p>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/thonny_first_interface.jpg"><img alt="alternate text" src="_images/thonny_first_interface.jpg" style="width: 600px; height: 450px;" /></a>
</figure>
<p>3-Click on <strong>Run>select interpreter</strong>, a new window opens click on interpret</p>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/thonny_option.jpg"><img alt="alternate text" src="_images/thonny_option.jpg" style="width: 600px; height: 450px;" /></a>
</figure>
<p>4-On the new open windows select <strong>alternative Pyhton3 or virtual environnement</strong></p>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/thonny_interpreter.jpg"><img alt="alternate text" src="_images/thonny_interpreter.jpg" style="width: 600px; height: 450px;" /></a>
</figure>
<p>5- New buttons appeared, selected <strong>“locate another python executable “</strong></p>
<p>6- A new window opens, find the folder where there is the python 3 file in the virtual environment folder previously created <strong>/home/pi/ohmpi/bin/python3</strong>.</p>
<p>7- In the <strong>known interpreter</strong> tab the path of the virtual environnementshould appear</p>
<figure class="align-center">
<a class="reference internal image-reference" href="_images/thonny_interpreter_folder.jpg"><img alt="alternate text" src="_images/thonny_interpreter_folder.jpg" style="width: 600px; height: 450px;" /></a>
421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490
</figure>
<p>8- Close the window by clicking on <strong>ok</strong>.</p>
<p>9- Close thonny to save modifications</p>
</section>
</section>
<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: 100%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><strong>Required components</strong></p></td>
</tr>
</tbody>
</table>
<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>
<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>
<p>Figure shows the general schematics for the electronic measurement board developed.
We have developed a complete “plug and play” 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. For the current measurement we have directly integrated the INA282 component,
which allows to realize precise current measurement around a shunt resistor. Les étapes de montage son décrite dans les étapes suivantes:</p>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°1</p></td>
<td><img alt="_images/01_mes_board.jpg" src="_images/01_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°2</p></td>
<td><img alt="_images/02_mes_board.jpg" src="_images/02_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering of 4 Dual-in-line- socket (2 by 2 pins) for
optical relay, AQY211EH.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°3</p></td>
<td><img alt="_images/03_mes_board.jpg" src="_images/03_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering of 1 Dual-in-line- socket (2 by 9 pins)
491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560
for INA282.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°4</p></td>
<td><img alt="_images/04_mes_board.jpg" src="_images/04_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering of 1 Dual-in-line- socket (2 by 4 pins)</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°5</p></td>
<td><img alt="_images/05_mes_board.jpg" src="_images/05_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering of 2 Dual-in-line- socket (2 by 4 pins)</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°6</p></td>
<td><img alt="_images/06_mes_board.jpg" src="_images/06_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Traco Power Supply 12V to 5V, TDH15 - 1211N</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°7</p></td>
<td><img alt="_images/07_mes_board.jpg" src="_images/07_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Four screw terminals for 12V inpout et 5V outpout</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°8</p></td>
<td><img alt="_images/08_mes_board.jpg" src="_images/08_mes_board.jpg" />
</td>
</tr>
561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630
<tr class="row-even"><td><p>Traco Power Supply 12V to 24V, TRN-1215</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
<col style="width: 88%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°9</p></td>
<td><img alt="_images/09_mes_board.jpg" src="_images/09_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Two screw terminals Electrodes M and N</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°10</p></td>
<td><img alt="_images/10_mes_board.jpg" src="_images/10_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Four screw treminal, for 12V power supply and for
Electrodes A and B</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°11</p></td>
<td><img alt="_images/11_mes_board.jpg" src="_images/11_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering three capacitors (100nF)</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°12</p></td>
<td><img alt="_images/12_mes_board.jpg" src="_images/12_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>2 ohms shunt resistor pre-adjustment</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°13</p></td>
<td><img alt="_images/13_mes_board.jpg" src="_images/13_mes_board.jpg" />
</td>
631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700
</tr>
<tr class="row-even"><td><p>Soldering 2 ohms shunt resistor</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°14</p></td>
<td><img alt="_images/14_mes_board.jpg" src="_images/14_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>1 Mohms Resistors</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°15</p></td>
<td><img alt="_images/15_mes_board.jpg" src="_images/15_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering tow 1Kohms resistors</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°16</p></td>
<td><img alt="_images/16_mes_board.jpg" src="_images/16_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering tow 1.5Kohms resistors</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°17</p></td>
<td><img alt="_images/17_mes_board.jpg" src="_images/17_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Soldering tow 1.5Kohms resistors</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°18</p></td>
<td><img alt="_images/18_mes_board.jpg" src="_images/18_mes_board.jpg" />
</td>
701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770
</tr>
<tr class="row-even"><td><p>Female header 2 by 20 pins for Raspberry Pi connection</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°19</p></td>
<td><img alt="_images/19_mes_board.jpg" src="_images/19_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>View of the Female header 2 by 20 pins installation
for Raspberry Pi connection</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°20</p></td>
<td><img alt="_images/20_mes_board.jpg" src="_images/20_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>1)Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°21</p></td>
<td><img alt="_images/21_mes_board.jpg" src="_images/21_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>1)Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°22</p></td>
<td><img alt="_images/22_mes_board.jpg" src="_images/22_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>1)Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°23</p></td>
<td><img alt="_images/23_mes_board.jpg" src="_images/23_mes_board.jpg" />
771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840
</td>
</tr>
<tr class="row-even"><td><p>1)Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<colgroup>
<col style="width: 13%" />
<col style="width: 87%" />
</colgroup>
<tbody>
<tr class="row-odd"><td rowspan="2"><p>Step n°24</p></td>
<td><img alt="_images/24_mes_board.jpg" src="_images/24_mes_board.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>1)Installation of female header, 1 by10 pins, for ADS1115</p></td>
</tr>
</tbody>
</table>
</section>
</section>
</section>
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