Commit b1d0cccd authored by Clement Remi's avatar Clement Remi
Browse files

update warning for current

parent 847c34b3
......@@ -325,7 +325,11 @@ We have developed a complete “plug and play” measurement board. To measure e
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. The assembly steps are described in the following steps:</p>
which allows to realize precise current measurement around a shunt resistor. The assembly are described in the following steps:</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>In this version, We used a shunt resistor of 2 ohms, which limits the current measurement to 48 mA. If the current is higher than this value, you just have to decrease the value of the shunt resistor.</p>
</div>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
......@@ -947,7 +951,7 @@ 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 +255,40 @@
</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.
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>
<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_01.jpg" src="../_images/MUX_01.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Take the Mux PCB</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
......
......@@ -40,9 +40,12 @@ We have developed a complete "plug and play" measurement board. To measure elect
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. The assembly steps are described in the following steps:
which allows to realize precise current measurement around a shunt resistor. The assembly are described in the following steps:
.. note::
In this version, We used a shunt resistor of 2 ohms, which limits the current measurement to 48 mA. If the current is higher than this value, you just have to decrease the value of the shunt resistor.
.. table::
:align: center
......@@ -461,5 +464,5 @@ 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 |
| | |
+--------+------------------------------------------------------------+
.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_3/a/MUX_01.jpg |
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
\ No newline at end of file
This diff is collapsed.
......@@ -325,7 +325,11 @@ We have developed a complete “plug and play” measurement board. To measure e
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. The assembly steps are described in the following steps:</p>
which allows to realize precise current measurement around a shunt resistor. The assembly are described in the following steps:</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>In this version, We used a shunt resistor of 2 ohms, which limits the current measurement to 48 mA. If the current is higher than this value, you just have to decrease the value of the shunt resistor.</p>
</div>
<table class="docutils align-center">
<colgroup>
<col style="width: 12%" />
......
......@@ -258,9 +258,8 @@
<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.
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.</p>
<table class="docutils align-center">
<colgroup>
......@@ -276,6 +275,20 @@ Each card has its own digital address between 0X70 and 0X77.</p>
</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>1</p></td>
<td><img alt="../_images/MUX_01.jpg" src="../_images/MUX_01.jpg" />
</td>
</tr>
<tr class="row-even"><td><p>Take the Mux PCB</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
......
......@@ -40,9 +40,12 @@ We have developed a complete "plug and play" measurement board. To measure elect
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. The assembly steps are described in the following steps:
which allows to realize precise current measurement around a shunt resistor. The assembly are described in the following steps:
.. note::
In this version, We used a shunt resistor of 2 ohms, which limits the current measurement to 48 mA. If the current is higher than this value, you just have to decrease the value of the shunt resistor.
.. table::
:align: center
......
......@@ -26,9 +26,7 @@ Required components
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.
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.
......@@ -40,4 +38,16 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
\ No newline at end of file
+--------+------------------------------------------------------------+
.. table::
:align: center
+--------+------------------------------------------------------------+
| | .. image:: step_n_3/a/MUX_01.jpg |
| 1 +------------------------------------------------------------+
| | Take the Mux PCB |
| | |
+--------+------------------------------------------------------------+
\ No newline at end of file
This diff is collapsed.
......@@ -40,9 +40,12 @@ We have developed a complete "plug and play" measurement board. To measure elect
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. The assembly steps are described in the following steps:
which allows to realize precise current measurement around a shunt resistor. The assembly are described in the following steps:
.. note::
In this version, We used a shunt resistor of 2 ohms, which limits the current measurement to 48 mA. If the current is higher than this value, you just have to decrease the value of the shunt resistor.
.. table::
:align: center
......
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