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Shunt vs Hall Effect
#21
And every time the unit has a change in power state (say, replacing the battery, or using a different usb wall-wort), this would need to be done. Altho, that's fairly easy to do. I have the code in one of my other projects that does just that. Fixes the internal reference so it gets an accurate reading of the voltages on the analog pins.

I've come to the conclusion that the ACS712 is just not good enough for my tastes. I want to have as little noise as possible and easy to work with. Depending on the project, I will be using some sort of transformer based sensor instead of a hall effect. For more accurate, and a lot more stable, imho
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#22
Note to self...always search before posting  Smile

I posted in my Build Thread seeking guidance, but clearly should have added here. 

I salvaged a LEM CAB300-C/SP2 fluxgate current sensor from my Mitsubishi Outlander PHEV battery pack. Was wanting to use it to monitor current at a point in my new system (yet to be built).

Whilst I get the discussion in this thread... if hall effects are suposedly less reliable... why would an automobile manufacturer opt for a hall effect over a shunt?
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#23
Shunt is used in digital electricity meters... accuracy...

Hall for auto is less dependent on accuracy, i.e. they just need to know a light is using approximately the right current to see if it is working. The low current also makes single chip solutions very cheap to produce..
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#24
The Hall effect in automobiles also can detect shorts as well without being burned up. So, if a hot wire rubs thru and makes contact with the chassis, the hall effect won't burn out, but a shunt might. In this case, the HE will detect a super high current flow and cause the computer to raise a flag (possibly).

As far as normal flow, the vehicle computer probably doesn't even "care" about the number of amps flowing. Pretty much all current is basically known for each circuit. All it cares about if there is any at all, and for how long. It's possible the HE just triggers a mosfet switch to say "Yes on" "No off"
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