I'd like to detect if a 120 VAC motor is on, nothing fancy, no voltage or current measurement needed, I just want to detect if the motor is on.
I was thinking of wrapping some wire around one of the power wires and feeding that wire to say A0 on my Arduino uno. Any voltage reading on A0 would be considered that the motor is on, maybe a high resistance pulldown resistor is needed or i can experiment with where the "on" threshold is.
I'm not sure if enough current would be induced into the wire such that the Arduino could detect anything
Anyone tried think this may work?