How to measure AC current

Thread Starter

jeffjohnvol

Joined Oct 15, 2008
37
I know there are devices like the Killawatt that already do this, but is there an easy low impedance circuit that can measure AC current going through a relay which produces a 0-5 volt DC signal for a micro controller to read?

I'm trying to get an Arduino to measure when a laser cutter is running and the current to the main power supply turns on. I would like to replicate this on other devices as well, so making a sensor on the laser cutter wouldn't suffice. I don't expect I need to measure anything over 15 amps, and even just a on/off for high current loads would suffice.

Thanks.
Jeff
 
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