Commit a1bd412c authored by Clement Remi's avatar Clement Remi
Browse files

update doc

parent 227819f8
......@@ -947,7 +947,7 @@ on the ground terminal.</p></td>
</td>
</tr>
<tr class="row-even"><td><p>Run Ohmpi_4elec.py, if everything works you should
get the following result</p></td>
get the following result (220 ohm)</p></td>
</tr>
</tbody>
</table>
......
......@@ -39,7 +39,7 @@
<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="reference internal" href="../V2_00.html">OhmPi V 2.xx (64 or 128 electrodes)</a><ul class="current">
<li class="toctree-l1 current"><a class="reference internal" href="../V2_00.html">OhmPi V 2.xx (64 or 128 electrodes and 12V)</a><ul class="current">
<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 current"><a class="reference internal" href="../V2_00.html#ohmpi-2-step-by-step">Ohmpi 2 step by step</a><ul class="current">
......@@ -69,7 +69,7 @@
<div role="navigation" aria-label="Page navigation">
<ul class="wy-breadcrumbs">
<li><a href="../index.html" class="icon icon-home"></a> &raquo;</li>
<li><a href="../V2_00.html">OhmPi V 2.xx (64 or 128 electrodes)</a> &raquo;</li>
<li><a href="../V2_00.html">OhmPi V 2.xx (64 or 128 electrodes and 12V)</a> &raquo;</li>
<li><strong>STEP n°3</strong>: MUX board</li>
<li class="wy-breadcrumbs-aside">
<a href="../_sources/Ohmpi_V2_00/V2_00_step_03.rst.txt" rel="nofollow"> View page source</a>
......@@ -255,6 +255,27 @@
</tr>
</tbody>
</table>
<p>The multiplexing of the channels is a mechanical multiplexing based on OMRON’s manufacturing relays (G5LE-1-VD 12 VDC). Each relay is combined with
a ZVN4206A power MOFSET. The raspberry has only 30 GPIOs, which is not enough to activate all the 64 electrodes, which represent 512 GPIOs.
We used gpio expender I2C (MCP23017). We have associated these components with an I2C muliplexer of type type TCA9548A from adafruit.
This combination allows to go up to 512 GPIOs and up to 128 electrodes.
Each card has its own digital address between 0X70 and 0X77.</p>
<p>In the following presentation for an Ohmpi 64 electrodes, we will use the addresses 0X70 for channel A, 0X71 for channel B, 0X72 for channel M and 0X73 for channel N.
0X73 for the N channel. 4 MUX board will be needed to multiplex an Ohmpi 64 electrodes.</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>1</p></td>
<td><img alt="../_images/MUX_00.jpg" src="../_images/MUX_00.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Take the Mux PCB</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
......
......@@ -461,5 +461,5 @@ Setting up an equivalent electronic circuit, for this you will need:
| | .. image:: step_n_2/c/20211206_144334.jpg |
|7 +------------------------------------------------------------+
| | Run Ohmpi_4elec.py, if everything works you should |
| | get the following result |
| | get the following result (220 ohm) |
+--------+------------------------------------------------------------+
**STEP n°3**: MUX board
****************************************************
**PART A** Assembly of MUX board
======================================================
Required components
----------------------------------------------------
.. figure:: step_n_3/a/00_mes_board_components.jpg
:width: 600px
:align: center
:height: 450px
:alt: alternate text
:figclass: align-center
.. csv-table:: List of components
:file: step_n_3/a/MUX_board_list_2_xx.csv
:widths: 30, 70, 70, 70, 70, 35, 35
:header-rows: 1
The multiplexing of the channels is a mechanical multiplexing based on OMRON's manufacturing relays (G5LE-1-VD 12 VDC). Each relay is combined with
a ZVN4206A power MOFSET. The raspberry has only 30 GPIOs, which is not enough to activate all the 64 electrodes, which represent 512 GPIOs.
We used gpio expender I2C (MCP23017). We have associated these components with an I2C muliplexer of type type TCA9548A from adafruit.
This combination allows to go up to 512 GPIOs and up to 128 electrodes.
Each card has its own digital address between 0X70 and 0X77.
In the following presentation for an Ohmpi 64 electrodes, we will use the addresses 0X70 for channel A, 0X71 for channel B, 0X72 for channel M and 0X73 for channel N.
0X73 for the N channel. 4 MUX board will be needed to multiplex an Ohmpi 64 electrodes.
.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_3/a/MUX_00.jpg |
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
\ No newline at end of file
This diff is collapsed.
......@@ -461,5 +461,5 @@ Setting up an equivalent electronic circuit, for this you will need:
| | .. image:: step_n_2/c/20211206_144334.jpg |
|7 +------------------------------------------------------------+
| | Run Ohmpi_4elec.py, if everything works you should |
| | get the following result |
| | get the following result (220 ohm) |
+--------+------------------------------------------------------------+
......@@ -21,4 +21,33 @@ Required components
.. csv-table:: List of components
:file: step_n_3/a/MUX_board_list_2_xx.csv
:widths: 30, 70, 70, 70, 70, 35, 35
:header-rows: 1
\ No newline at end of file
:header-rows: 1
The multiplexing of the channels is a mechanical multiplexing based on OMRON's manufacturing relays (G5LE-1-VD 12 VDC). Each relay is combined with
a ZVN4206A power MOFSET. The raspberry has only 30 GPIOs, which is not enough to activate all the 64 electrodes, which represent 512 GPIOs.
We used gpio expender I2C (MCP23017). We have associated these components with an I2C muliplexer of type type TCA9548A from adafruit.
This combination allows to go up to 512 GPIOs and up to 128 electrodes. Each card has its own digital address between 0X70 and 0X77.
In the following presentation for an Ohmpi 64 electrodes, we will use the addresses 0X70 for channel A, 0X71 for channel B, 0X72 for channel M and 0X73 for channel N.
0X73 for the N channel. 4 MUX board will be needed to multiplex an Ohmpi 64 electrodes.
.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_3/a/MUX_00.jpg |
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_3/a/MUX_01.jpg |
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
\ No newline at end of file
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