So, I am trying to use a YHDC SCT-013 to read a current from my mains supply. I have Solar power, and ultimate aim is to measure when net overall usage < -3Kw and turn on the immersion heater. SCT device attached around the thick Live (brown, UK) cable
The results were a bit unreliable, so I have sampled the analogue reading and plotted it here (x-axis is microseconds, y is A0 reading). my concerns:
1 - not centred on 512
2 - not a smooth curve
have i done something stupidly wrong?
the circuit is the top board in the picture. 5V across a voltage divider, 33ohn burden resistor