Cheap Current Sensors - Allowing for negative reading on A1 and A2

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Which board (stock / gruvin9x / sky9x) are you using?

Atmega128 on Stock Board

Ok, let's see if I can explain this idea.
I've been following a thread on 9xforums.com about those cheap current sensors 
that you get from China. They are quite cheap.
The problem is that some of them read negative and positive current with zero 
amps at 2.5V
So from 2.5V to aprox 0V they read from 0A to -100A
from 2,5V to aprox 5V they read from 0A to 100A

There was someone trying to make it work with open9x and he was using the 
negative side of the measurement because apparentlly can get more resolution. 
so then we have 0 Amps at 2.5V and -100 in theory at 0V
the reading of the analog ports would as far as I understand have to be 
inverted?

well, you get the idea. It would be nice if we could use those sensors because 
they are so cheap and we never know, maybe the possibility to read negative 
values would be a good addition to open9x..

I do apologise if I'm not able to explain it properly..

JHSA

Original issue reported on code.google.com by joaoalve...@googlemail.com on 23 Feb 2013 at 5:31

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Original comment by bson...@gmail.com on 23 Feb 2013 at 5:38

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Enhancement moved to openTx

Original comment by bson...@gmail.com on 28 Mar 2013 at 7:43

• Changed state: WontFix