High Current Hall Sensor - Car Battery Monitoring System

Using Arduino General Electronics
1

I am currently working on a car battery monitoring system that I will make into a PCB design for a project.

One key factor is determining the batteries health.
To do so I will measure voltage, current and temperature.

For voltage I will use a voltage divider.
For temperature I will use TMP36.
As for the current I was looking at the acs755scb-200 which can measure up to 200A and can be run in parallel with another to increase this.

I don't want to cut the cars wiring in order to get measurements so ideally I would connect each it to the battery terminal.

Another option I have been thinking about is using such hall effect sensor but as a clamp in which I could camp around the positive wire of the battery.
I would like some insight into this and see if any there is any other ideas or workarounds.
Thanks.

2

A HED should work fine for DC incorporated in a clamp and I think such devices are made, or you could brew your own. The problem would be calibrating it as you need to provide an air gap in the clamp magnetic circuit to make sure the core doesn't saturate. The material could be solid soft iron as it's DC not AC. If you don't want to cut the cable to thread it through the clamp you'd need to have a split core.

3

Put your current sensor in the battery ground wire. Same current, but much easier to work with. Likely it is bolted to the vehicle frame.

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