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<!DOCTYPE html><html class="writer-html5" lang="en" ><head> <meta charset="utf-8" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>STEP n°2: Measurement board — OhmPi v2024rc documentation</title> <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../../_static/css/theme.css" type="text/css" /> <!--[if lt IE 9]> <script src="../../_static/js/html5shiv.min.js"></script> <![endif]--> <script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script> <script src="../../_static/jquery.js"></script> <script src="../../_static/underscore.js"></script> <script src="../../_static/_sphinx_javascript_frameworks_compat.js"></script> <script src="../../_static/doctools.js"></script> <script src="../../_static/js/theme.js"></script> <link rel="index" title="Index" href="../../genindex.html" /> <link rel="search" title="Search" href="../../search.html" /> </head><body class="wy-body-for-nav"> <div class="wy-grid-for-nav"> <nav data-toggle="wy-nav-shift" class="wy-nav-side"> <div class="wy-side-scroll"> <div class="wy-side-nav-search" > <a href="../../index.html" class="icon icon-home"> OhmPi </a><div role="search"> <form id="rtd-search-form" class="wy-form" action="../../search.html" method="get"> <input type="text" name="q" placeholder="Search docs" aria-label="Search docs" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form></div> </div><div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="Navigation menu"> <ul><li class="toctree-l1"><a class="reference internal" href="../Ohmpi.html">OhmPi project</a></li><li class="toctree-l1"><a class="reference internal" href="../hardware.html">Hardware</a></li><li class="toctree-l1"><a class="reference internal" href="../software.html">Software and operation</a></li><li class="toctree-l1"><a class="reference internal" href="../api.html">API reference</a></li><li class="toctree-l1"><a class="reference internal" href="../troubleshooting.html">Troubleshooting</a></li><li class="toctree-l1"><a class="reference internal" href="../gallery.html">Examples of applications</a></li><li class="toctree-l1"><a class="reference internal" href="../developing_hardware_components.html">Software interface to new hardware components</a></li><li class="toctree-l1"><a class="reference internal" href="../archived_version.html">Archived versions</a></li></ul> </div> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" > <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../../index.html">OhmPi</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="Page navigation"> <ul class="wy-breadcrumbs"> <li><a href="../../index.html" class="icon icon-home" aria-label="Home"></a></li> <li class="breadcrumb-item active"><strong>STEP n°2</strong>: Measurement board</li> <li class="wy-breadcrumbs-aside"> <a href="../../_sources/source_rst/V2024.x.x/V2024_step_02.rst.txt" rel="nofollow"> View page source</a>7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
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<section id="step-n2-measurement-board">
<h1><strong>STEP n°2</strong>: Measurement board<a class="headerlink" href="#step-n2-measurement-board" title="Permalink to this heading"></a></h1>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p><strong>Ohmpi is a participative project open to all, it requires skills in electronics and to respect the safety rules. OhmPi must be assembled in a professional context and by people competent in electronics. The OhmPi team cannot be held responsible for any material or human damage which would be associated with the use or the assembly of OHMPI. The OhmPi team cannot be held responsible if the equipment does not work after assembly.</strong></p>
</div>
<section id="part-a-assembly-of-the-measurement-board">
<h2><strong>PART A</strong> Assembly of the measurement board<a class="headerlink" href="#part-a-assembly-of-the-measurement-board" title="Permalink to this heading"></a></h2>
<section id="required-components">
<h3>Required components<a class="headerlink" href="#required-components" title="Permalink to this heading"></a></h3>
<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>
<table class="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>
<col style="width: 8%" />
<col style="width: 18%" />
<col style="width: 18%" />
<col style="width: 18%" />
<col style="width: 18%" />
<col style="width: 9%" />
<col style="width: 9%" />
</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>
<th class="head"><p>Web reference</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Raspberry Pi 4 Model B</p></td>
<td><p>1</p></td>
<td><p>58,75</p></td>
<td><p>58,75</p></td>
<td><p>Raspberry</p></td>
<td><p>Raspberry Pi 4 Model B</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Seeed-Studio/102110421?qs=7MVldsJ5UaxeN3LYyh3sqw%3D%3D">https://www.mouser.fr/ProductDetail/Seeed-Studio/102110421?qs=7MVldsJ5UaxeN3LYyh3sqw%3D%3D</a></p></td>
</tr>
<tr class="row-odd"><td><p>LM158N AMP-o</p></td>
<td><p>2</p></td>
<td><p>14,5</p></td>
<td><p>58</p></td>
<td><p>Texas Instruments</p></td>
<td><p>LM358AN/NOPB</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Texas-Instruments/LM158J?qs=X1J7HmVL2ZH8vpEfMl8%2FFQ%3D%3D">https://www.mouser.fr/ProductDetail/Texas-Instruments/LM158J?qs=X1J7HmVL2ZH8vpEfMl8%2FFQ%3D%3D</a></p></td>
</tr>
<tr class="row-even"><td><p>Printed circuit board</p></td>
<td><p>1</p></td>
<td><p>12</p></td>
<td><p>12</p></td>
<td><p>Asler</p></td>
<td><ul class="simple">
<li></li>
</ul>
</td>
<td><ul class="simple">
<li></li>
</ul>
141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210
</td>
</tr>
<tr class="row-odd"><td><p>ADS1115</p></td>
<td><p>2</p></td>
<td><p>11,9</p></td>
<td><p>23,8</p></td>
<td><p>Adafruit</p></td>
<td><p>1085</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Adafruit/1085?qs=%2Fha2pyFaduhE%2FOGzuTWIQ9Iz5VjaqFOYugqAlGxpEcKiGrQvF4hn%252Bg%3D%3D">https://www.mouser.fr/ProductDetail/Adafruit/1085?qs=%2Fha2pyFaduhE%2FOGzuTWIQ9Iz5VjaqFOYugqAlGxpEcKiGrQvF4hn%252Bg%3D%3D</a></p></td>
</tr>
<tr class="row-even"><td><p>Capacitor 100nF 50Vdc 10% Ceramic</p></td>
<td><p>3</p></td>
<td><p>0,2</p></td>
<td><p>0,8</p></td>
<td><p>KEMET</p></td>
<td><p>C320C104K1</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/KEMET/C320C104K1R5TA7303?qs=c4UyoTs%2FLq1th4mcyOeTmA%3D%3D">https://www.mouser.fr/ProductDetail/KEMET/C320C104K1R5TA7303?qs=c4UyoTs%2FLq1th4mcyOeTmA%3D%3D</a></p></td>
</tr>
<tr class="row-odd"><td><p>Resistor 1 Kohm 0.5W +- 0.1%</p></td>
<td><p>2</p></td>
<td><p>1,3</p></td>
<td><p>2,6</p></td>
<td><p>TE Connectivity</p></td>
<td><p>H81K0BYA</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/TE-Connectivity-Holsworthy/H81K0BYA?qs=%2Fha2pyFaduhUylh7Az%2FmjFH2XjOUms6wZtUX4sOM%252BII%3D">https://www.mouser.fr/ProductDetail/TE-Connectivity-Holsworthy/H81K0BYA?qs=%2Fha2pyFaduhUylh7Az%2FmjFH2XjOUms6wZtUX4sOM%252BII%3D</a></p></td>
</tr>
<tr class="row-even"><td><p>Resistor 1.5 Kohms +- 0.1%</p></td>
<td><p>2</p></td>
<td><p>1,3</p></td>
<td><p>2,6</p></td>
<td><p>TE Connectivity</p></td>
<td><p>H81K5BYA</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/TE-Connectivity-Holsworthy/H81K5BYA?qs=%2Fha2pyFadugy9tWham3rU9HmIJOhyWhBIN95kNm%252BX%2FM%3D">https://www.mouser.fr/ProductDetail/TE-Connectivity-Holsworthy/H81K5BYA?qs=%2Fha2pyFadugy9tWham3rU9HmIJOhyWhBIN95kNm%252BX%2FM%3D</a></p></td>
</tr>
<tr class="row-odd"><td><p>Resistor 1.5 Kohms +- 5%</p></td>
<td><p>2</p></td>
<td><p>1,3</p></td>
<td><p>2,6</p></td>
<td><p>Vishay</p></td>
<td><p>CCF071K50GKE36</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Vishay-Dale/CCF071K50GKE36?qs=QKEOZdL6EQpA6LZRLQFVOw%3D%3D">https://www.mouser.fr/ProductDetail/Vishay-Dale/CCF071K50GKE36?qs=QKEOZdL6EQpA6LZRLQFVOw%3D%3D</a></p></td>
</tr>
<tr class="row-even"><td><p>Resistor 10 Mohms +-5%</p></td>
<td><p>2</p></td>
<td><p>0,762</p></td>
<td><p>1,524</p></td>
<td><p>VISHAY</p></td>
<td><p>CMF651M0000FKEK143</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Vishay-Dale/CMF651M0000FKEK143?qs=CiayqK2gdcKzIA2LEVaLkg%3D%3D">https://www.mouser.fr/ProductDetail/Vishay-Dale/CMF651M0000FKEK143?qs=CiayqK2gdcKzIA2LEVaLkg%3D%3D</a></p></td>
</tr>
<tr class="row-odd"><td><p>2 ohm shunt resistor+- 1%</p></td>
<td><p>1</p></td>
<td><p>2,42</p></td>
<td><p>2,42</p></td>
<td><p>Ohmite</p></td>
<td><p>41F2R0E</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/Ohmite/41F2R0E?qs=IM6ToxQzGOAuEDprb19mHA%3D%3D">https://www.mouser.fr/ProductDetail/Ohmite/41F2R0E?qs=IM6ToxQzGOAuEDprb19mHA%3D%3D</a></p></td>
</tr>
<tr class="row-even"><td><p>Dual screw terminal (5.08-mm pitch)</p></td>
<td><p>5</p></td>
<td><p>0,648</p></td>
<td><p>3,24</p></td>
<td><p>CUI Devices</p></td>
<td><p>TB009-508-02BE</p></td>
<td><p><a class="reference external" href="https://www.mouser.fr/ProductDetail/CUI-Devices/TB009-508-02BE?qs=vLWxofP3U2wCFk5uCkWTkA%3D%3D">https://www.mouser.fr/ProductDetail/CUI-Devices/TB009-508-02BE?qs=vLWxofP3U2wCFk5uCkWTkA%3D%3D</a></p></td>
</tr>
<tr class="row-odd"><td><p>DC/DC converter 12 to 24V</p></td>
<td><p>1</p></td>
<td><p>15,58</p></td>
<td><p>31,16</p></td>