Any suggestions for an easy circuit that can tell me if 110VAC is on or off by providing a 5V(on) and 0V(off) signal? I don't need this to be a power source only a telemetry signal that will interface with an arduino digital input. So far the easiest thing I can think of is to just use an old wall wart to do the conversion, but if there is a simple circuit I could create then I'd prefer that. Thanks for the suggestions.
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