Hi Robin,
thanks for thinking along. The scanner does not clamp the negative holder while scanning or something.
Because the scanning takes quite some time and is a bit dependent on the type of scan, i thought it would be nice to have a feedback loop with the controller so it works reliably and efficient.
I just came across a ACS712 5A current sensing module. I think putting this between the poweradapter and scanner is nice because I can sense the current consumption over time. The circuit that is sensed and the circuit connected to the Arduino are isolated so that could work nicely.
Any experience/thoughts on this approach?