I am trying to determine is an AC water pump is running or not with an Arduino. The pump is plugged in to an outlet. I could use a 220V relay that closes a circuit attached to and digital input, but that's too mechanical. I googled a bit and came upon these two schematics using optocouplers, please…

Detecting if AC appliance is powered

martin_bg March 21, 2012, 1:55pm 7

Thank you for your answers, I think the case can be closed.

Topic		Replies	Views
How to detect AC voltage (not measuring) General Electronics	12	21987	May 6, 2021
Detect presence of 230v - not measure General Electronics	23	17521	May 6, 2021
Using optocoupler for 220V signal General Electronics	7	19845	May 6, 2021
current/voltage sensor? General Electronics	30	36068	May 6, 2021
Power consumption of AC monitoring with optocoupler General Electronics	34	11117	May 6, 2021