I’ve now had a chance to try different LM4040 voltage regulator and a new data logger board, i.e. a clean setup completely disconnected from the volta...

You are most helpful to do that work. I’ll have to wait a bit for parts. And, find a way to rig up a separate PS. Unlike you, I don’t have a bench po...

I've took the ACS712 off the same data logger board as the 30V voltage sensor and LM4040 reference voltage card, and now have 'sensible' zero results ...

I’ll check the soldering tomorrow. Your last but one response showed the connections for the voltage sensor but my problem is with the ACS712 curre...

Physically, the VCC on ACS712 board is connected to the 4020 board 4.096V output pin and to the Uno VRef pin.

@inst-tech I've set up the board using the 4020 reference connected to VCC. And, changed the code as I believe I should. Rather than take multi...

@will, Thanks for the response. I now have a working voltage recorder and LCD display based on the Hall-effect sensor. I'm now trying to create a...

The recently seen YouTube video on this topic raised a question in my mind about how frequently the Arduino can measure voltage. It’s of particular in...