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......@@ -99,72 +50,33 @@
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<h1>OhmPi project<a class="headerlink" href="#ohmpi-project" title="Permalink to this headline"></a></h1>
<section id="partenaires">
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<h2><strong>Partenaires</strong><a class="headerlink" href="#partenaires" title="Permalink to this headline"></a></h2>
<a class="reference internal image-reference" href="_images/logo_ohmpi.JPG"><img alt="Logo OhmPi" class="align-center" src="_images/logo_ohmpi.JPG" style="width: 350px; height: 250px;" /></a>
<p>Authors:</p>
......@@ -198,13 +110,13 @@
<p>Creation date : Juillet 2020.</p>
<p>Update : 04 août 2021.</p>
<p>Status of document: In progress.</p>
<section id="citing-ohmpi">
<div class="section" id="citing-ohmpi">
<h3><strong>Citing OhmPi</strong><a class="headerlink" href="#citing-ohmpi" title="Permalink to this headline"></a></h3>
<p><em>Rémi Clement, Yannick Fargier, Vivien Dubois, Julien Gance, Emile Gros, et al.. OhmPi: An open</em>
<em>source data logger for dedicated applications of electrical resistivity imaging at the small and laboratory</em>
<em>scale. HardwareX, Elsevier, 2020, 8, 24 p. ff10.1016/j.ohx.2020.e00122ff.</em></p>
</section>
<section id="introduction-to-ohmpi">
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<div class="section" id="introduction-to-ohmpi">
<h3><strong>Introduction to OhmPi</strong><a class="headerlink" href="#introduction-to-ohmpi" title="Permalink to this headline"></a></h3>
<p>This documentation presents the development of a low-cost, open hardware resistivity meter to provide the scientific community with a robust and flexible tool for small-scale experiments. Called OhmPi, this basic resistivity meterfeatures current injection and measurement functions associated with a multiplexer that allows performing automatic measurements with up to 32 electrodes.OhmPi’s philosophy is to provide a fully open source and open hardware tool /
to the near surface scientific community.</p>
......@@ -212,64 +124,39 @@ to the near surface scientific community.</p>
<p class="admonition-title">Note</p>
<p>Everyone willing to get involved is welcome in OhmPi Project!.</p>
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<div class="section" id="ohmpi-v-2-xx-64-or-128-electrodes">
<h1>OhmPi V 2.xx (64 or 128 electrodes)<a class="headerlink" href="#ohmpi-v-2-xx-64-or-128-electrodes" title="Permalink to this headline"></a></h1>
<figure class="align-center">
<div class="align-center figure">
<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">
</div>
<div class="align-center figure">
<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>
<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.
......@@ -188,14 +100,14 @@ This new version is made up of:</p>
<li><p>A box</p></li>
</ol>
</div>
<section id="the-philosophy-of-ohmpi">
<div class="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">
</div>
<div class="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>
......@@ -283,10 +195,10 @@ control system</p></td>
</tr>
</tbody>
</table>
</section>
<section id="step-n1-raspberry-pi-configuration">
</div>
<div class="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">
<div class="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>
......@@ -324,9 +236,9 @@ For this step, the installation instructions are well described on the Raspberry
<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">
<div class="align-center figure">
<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>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
......@@ -362,8 +274,8 @@ To ensure that the GPIOs are in Low position, you will need to modify the /boot/
<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">
</div>
<div class="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>
......@@ -398,34 +310,34 @@ 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">
</div>
<div class="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 &gt; programming&gt; 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">
<div class="align-center figure">
<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>
</div>
<p>3-Click on <strong>Run&gt;select interpreter</strong>, a new window opens click on interpret</p>
<figure class="align-center">
<div class="align-center figure">
<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>
</div>
<p>4-On the new open windows select <strong>alternative Pyhton3 or virtual environnement</strong></p>
<figure class="align-center">
<div class="align-center figure">
<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>
</div>
<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">
<div class="align-center figure">
<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>
</figure>
</div>
<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">
</div>
</div>
<div class="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>
......@@ -436,9 +348,9 @@ to leave the virtual environment simply type:</p>
</tr>
</tbody>
</table>
<figure class="align-center">
<div class="align-center figure">
<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>
</div>
<table class="colwidths-given docutils align-default" id="id1">
<caption><span class="caption-text">List of components</span><a class="headerlink" href="#id1" title="Permalink to this table"></a></caption>
<colgroup>
......@@ -661,11 +573,11 @@ to leave the virtual environment simply type:</p>
</tr>
</tbody>
</table>
<section id="description">
<div class="section" id="description">
<h3>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h3>
<figure class="align-center">
<div class="align-center figure">
<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>
<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
......@@ -1012,9 +924,9 @@ for Raspberry Pi connection</p></td>
</tr>
</tbody>
</table>
</section>
</section>
<section id="step-n3-start-up-of-the-measurement-board">
</div>
</div>
<div class="section" id="step-n3-start-up-of-the-measurement-board">
<h2><strong>STEP n°3</strong>: Start-up of the measurement board.<a class="headerlink" href="#step-n3-start-up-of-the-measurement-board" title="Permalink to this headline"></a></h2>
<table class="docutils align-default">
<colgroup>
......@@ -1150,8 +1062,8 @@ Raspberry Pi’s power port.</p></td>
</tr>
</tbody>
</table>
</section>
<section id="step-n4-measurement-board-validation">