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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°4: assemble the OhmPi — 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°4:</strong> assemble the OhmPi</li> <li class="wy-breadcrumbs-aside"> <a href="../../_sources/source_rst/V2024.x.x/V2024_step_04.rst.txt" rel="nofollow"> View page source</a>7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<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="step-n4-assemble-the-ohmpi">
<h1><strong>STEP n°4:</strong> assemble the OhmPi<a class="headerlink" href="#step-n4-assemble-the-ohmpi" title="Permalink to this heading"></a></h1>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>1</p></td>
<td><img alt="../../_images/step_4_1.jpg" src="../../_images/step_4_1.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut 4 ribbon cables composed of 16 wires each to the proper
length (about 1.5m). Each wire corresponds to an electrode.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>2</p></td>
<td><img alt="../../_images/step_4_2.jpg" src="../../_images/step_4_2.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Crimp the ribbon cable on the corresponding idc connector
with a suitable clamp. Pay attention to the direction of
the cables. Unbalanced IDC connector. The ribbon cable must
be perpendicular to the connector.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>3</p></td>
<td><img alt="../../_images/step_4_3.jpg" src="../../_images/step_4_3.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Example of IDC connector mounting. The wires should run as
perpendicular as possible to the IDC connector.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>4</p></td>
<td><img alt="../../_images/step_4_4.jpg" src="../../_images/step_4_4.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Same for a 6 wires ribbon cable of 1 m length.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>5</p></td>
<td><img alt="../../_images/step_4_5.jpg" src="../../_images/step_4_5.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut the ribbon cable flush with the IDC connector.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210
<tr class="row-odd"><td rowspan="4"><p>6</p></td>
<td><img alt="../../_images/step_4_6.jpg" src="../../_images/step_4_6.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Position 9 spacers above the MUX board, and 9 spacers below</p></td>
</tr>
<tr class="row-odd"><td><img alt="../../_images/step_4_7.jpg" src="../../_images/step_4_7.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Profile view for mounting the spacers above and below.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>7</p></td>
<td><img alt="../../_images/step_4_8.jpg" src="../../_images/step_4_8.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a 50 cm long wire of any color (here yellow). Strip and
tin each end of the wire. Install the wire “A” on the screw
terminal of MUX board « A ».</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>8</p></td>
<td><img alt="../../_images/step_4_9.jpg" src="../../_images/step_4_9.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a red wire and a black wire of 50 cm length. Strip, tin
and position the wires on the left screw terminal as shown
in the picture: i)Red wire 12 V, ii) Black wire GND</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>9</p></td>
<td><img alt="../../_images/step_4_10.jpg" src="../../_images/step_4_10.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Mount the 4 ribbon cables (16-wires each) with IDC
connectors. A small noise is often heard when the IDC
connector is clipped in place.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>10</p></td>
<td><img alt="../../_images/step_4_11.jpg" src="../../_images/step_4_11.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Mount the ribbon cables with 6-wires with the corresponding
IDC connectors</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>11</p></td>
<td><img alt="../../_images/step_4_12.jpg" src="../../_images/step_4_12.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a red wire and a black wire of 10 cm length. Strip and
tin the wires at the ends. Mount the red wire on the 12V
input and the black wire on the GND input on the right
screw terminal.</p></td>
211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>12</p></td>
<td><img alt="../../_images/step_4_13.jpg" src="../../_images/step_4_13.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Mount and fix the second MUX board “B” on the first with
the help of 9 spacers.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>13</p></td>
<td><img alt="../../_images/step_4_14.jpg" src="../../_images/step_4_14.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut, strip and tin a red wire and a black wire of 10 cm
length. Mount the wires on the left screw terminal.
Red wire 12V input, black wire GND input.
Connect the red and black wires from board A to the right
screw terminal of board B. Red wire 12V input. Black wire
GND input.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>14</p></td>
<td><img alt="../../_images/step_4_15.jpg" src="../../_images/step_4_15.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Crimp a 16 wires IDC connector on the ribbon cable at about
15 cm from the previous connector. Please, pay attention to
the direction of the cable before the crimp procedure.
Mount the ribbon cable on the IDC connector on the board.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>15</p></td>
<td><img alt="../../_images/step_4_16.jpg" src="../../_images/step_4_16.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Repeat the operation for the other 3 ribbon cables.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>16</p></td>
<td><img alt="../../_images/step_4_17.jpg" src="../../_images/step_4_17.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Repeat the operation for the 6 wires ribbon cable.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>17</p></td>
<td><img alt="../../_images/step_4_18.jpg" src="../../_images/step_4_18.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a 50 cm long wire “here purple” (Color not relevant but
to be defined). Strip and tin the wire at its ends.
281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350
Position the wire on the input B of the screw terminal of
the multiplexing board B.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>18</p></td>
<td><img alt="../../_images/step_4_19.jpg" src="../../_images/step_4_19.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Repeat all these operations for the third MUX board
called “M”.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>19</p></td>
<td><img alt="../../_images/step_4_20.jpg" src="../../_images/step_4_20.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Repeat the operations for the fourth MUX Boards. Attention,
it is necessary to position 5 different spacers (here nylon
screw hex spacers) in between the “M” board and the “N” MUX
Board (as shown on the photograph). Refer to the following
photographs for more details on the assembly of the spacers</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>20</p></td>
<td><img alt="../../_images/step_4_21.jpg" src="../../_images/step_4_21.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>When mounting the 4th MUX board (“N”), screws can be placed
on the nylon spacers to fix the boards together. Note that
the other spacers could be used for this purpose.
Connect ribbon cables (16 wires) from board 3 to board 4 as
previously described. Connect the red wire (12V) of MUX
board “M” to the 12V terminal of the right screw terminal
of MUX Board “N”. Connect the black wire (GND) of MUX board
“M” to the GND screw terminal on MUX board “N”.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>21</p></td>
<td><img alt="../../_images/step_4_22.jpg" src="../../_images/step_4_22.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a red wire and a black wire of one meter length. Place
the red wire on terminal “12V” and the black wire on
terminal “GND” of the left screw terminal. Tie the wires
together.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>22</p></td>
<td><img alt="../../_images/step_4_23.jpg" src="../../_images/step_4_23.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Tie the A, B, M and N wires together</p></td>
</tr>
</tbody>
</table>
351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>23</p></td>
<td><img alt="../../_images/step_4_24.jpg" src="../../_images/step_4_24.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Cut a PVC plate with the following minimum dimensions :
200 mm * 150 mm * 5 mm</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>24</p></td>
<td><img alt="../../_images/step_4_25.jpg" src="../../_images/step_4_25.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Drill the plate to mount it on the remaining metal spacers.
Do not tighten the assembly.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>25</p></td>
<td><img alt="../../_images/step_4_26.jpg" src="../../_images/step_4_26.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Position the Raspberry Pi (RPI) board on the plate so that
you can access the USB ports. Mark the holes of the RPI
board on the plate for mounting.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>26</p></td>
<td><img alt="../../_images/step_4_27.jpg" src="../../_images/step_4_27.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Add spacers on the PVC plate.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>27</p></td>
<td><img alt="../../_images/step_4_28.jpg" src="../../_images/step_4_28.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Attach the PVC plate to the metal spacers with washers
and nuts.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>28</p></td>
<td><img alt="../../_images/step_4_29.jpg" src="../../_images/step_4_29.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Position and fix the RPI card on the spacers</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>29</p></td>
<td><img alt="../../_images/step_4_30.jpg" src="../../_images/step_4_30.jpg" />
</td>
421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490
</tr>
<tr class="row-even"><td><p>Add spacers on the RPI board. The red (12V) and black (GND)
wires coming out of the “M” MUX board must pass under
the RPI board.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>30</p></td>
<td><img alt="../../_images/step_4_31.jpg" src="../../_images/step_4_31.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Place the measurement board on the RPI GPIO outputs and on
the pre-positioned spacers. Note that LEDs are present on
this measurement board with an associated resistance simply
for testing purposes (do not consider this temporary
modification of the board). Same for the orange wire
present on the board.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>31</p></td>
<td><img alt="../../_images/step_4_32.jpg" src="../../_images/step_4_32.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Connect the wires ” A ” (here yellow), ” B ” (here purple),
” M ” (here brown) and ” N ” (here blue) on the
corresponding terminal blocks on the measurement board.
Connect the 6 wires ribbon cable on the measurement board
by passing under the PVC plate.Connect the red and black
wires to the 12 V and GND terminal block.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>32</p></td>
<td><img alt="../../_images/step_4_33.jpg" src="../../_images/step_4_33.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Top view of the assembly. Add clips to secure the wires
together.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>33</p></td>
<td><img alt="../../_images/step_4_34.jpg" src="../../_images/step_4_34.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Second view.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>34</p></td>
<td><img alt="../../_images/step_4_35.jpg" src="../../_images/step_4_35.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Zoom in on the connection of the M and N wires.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560
<tr class="row-odd"><td rowspan="2"><p>35</p></td>
<td><img alt="../../_images/step_4_36.jpg" src="../../_images/step_4_36.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Zoom in on the connection of the A and B wires.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>36</p></td>
<td><img alt="../../_images/step_4_37.jpg" src="../../_images/step_4_37.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Zoom in on the connection of the « 12V » and « GND » wires.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>37</p></td>
<td><img alt="../../_images/step_4_38.jpg" src="../../_images/step_4_38.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Fixing the measurement board on the spacers present on the
RPI board.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>38</p></td>
<td><img alt="../../_images/step_4_39.jpg" src="../../_images/step_4_39.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Place the SD card containing the OS and the pre-installed
programs. Connect a mouse and a keyboard to the USB inputs
of the RPI board. Connect a monitor to the HDMI output of
the RPI board.</p></td>
</tr>
</tbody>
</table>
<table class="docutils align-center">
<tbody>
<tr class="row-odd"><td rowspan="2"><p>39</p></td>
<td><img alt="../../_images/step_4_40.jpg" src="../../_images/step_4_40.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Connect the red and black cables of board A to a 12V
battery or other laboratory power supply delivering a 12VDC
voltage.
Enjoy</p></td>
</tr>
</tbody>
</table>
</section>
</div>
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