V2_00.rst



OhmPi V 2.00 (64 electrodes and 12V)


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:

A measurement board for four-point measurement
4 multiplexer cards
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
control system
18.5
W
18.5
W


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