********************************************
OhmPi V 2.00 (64 electrodes and 12V)
******************************************** 

.. figure:: Under-Construction.png
	   :width: 500px
	   :align: center
	   :height: 250px
	   :alt: Ohmpi 2
	   :figclass: align-center

.. figure:: image_ohmpi_2.jpg
	   :width: 400px
	   :align: center
	   :height: 350px
	   :alt: Ohmpi 2
	   :figclass: align-center

.. note:: 
	 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.
	 This new version is made up of: 
	 
	 1. A measurement board for four-point measurement
	 
	 2. 4 multiplexer cards
	 
	 3. A box 

The philosophy of Ohmpi 2 
==========================

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.
	
=============================================================================================================================================================

 
Technical data
==============

+-------------------------------+-----------------------+-----------+-----------------------+-----------+
| **Parameter**                 | **Specifications V1** | Units     | **Specifications v2** | Units     |
+===============================+=======================+===========+=======================+===========+
|Electrodes                     |32                     |           |64 to 128              |           |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Operating temperature          |-0 to 50               |°c         |-25 to 50              |°c         |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Power consumption of CPU and   |18.5                   |W          |18.5                   |W          |              
|control system                 |                       |           |                       |           |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Voltage injection              |12                     |V          |12                     |V          |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Battery                        |9                      |V          |12                     |V          |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Current                        |0 to 40                |mA         |0 to 40                |mA         |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Min pulse duration             |150                    |mS         |150                    |mS         |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Input impedance                |80                     |Mohm       |80                     |Mohm       |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Data storage                   |micro SD card          |           |micro SD card          |           |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+
|Resolution                     |0.01                   |ohm        |0.01                   |ohm        |
+-------------------------------+-----------------------+-----------+-----------------------+-----------+

Ohmpi 2 step by step
====================

.. toctree:: 
   :maxdepth: 2 

   Ohmpi_V2_00/V2_00_step_01
   Ohmpi_V2_00/V2_00_step_02
   Ohmpi_V2_00/V2_00_step_03
   Ohmpi_V2_00/V2_00_step_04