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Old 03-20-2014, 05:03 PM   #3 (permalink)
mechman600
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Join Date: Jul 2008
Location: Langley, BC
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Fusion - '16 Ford Fusion Hybrid SE
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My car doesn't actually have an ammeter. I know, I know. Lame. I have used a remote one on my multimeter in the past, so I have a pretty good idea of current vs voltage sag, so I just never bothered. But with an Ah counter, it will be essential.

I still have the hall effect amp transducer that I used to use when I was running a separate field controller with my former sepex motor. It is a 0-400A amp sensor (600A peak) - 0-5V analog output. 2.5V is 0 amps. Output goes up for one current direction and down in reverse direction. It is quite accurate, as far as I can tell.
This one: http://www.farnell.com/datasheets/30908.pdf

Volts is easy. Arduino GND to the most negative battery pack post. Then each positive post signal goes through a 10K/500 voltage splitter (so 100V = 5V) to Arduino A0-A5.
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