Thoughts on this standby power solution

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BrandonFoote

I am currently working on a machine that can sense when an appliance is utilizing standby power. I want said machine to work according to the detection.

Do any of you know if this can be done without having to use a microcontroller? The machine is going need some memory functions, so I've used an Arduino.

Still, it will need to store memory somehow. ThoughtS?
 
You need a latch of some kind.

Relays will do it, for the analog options -- an op-amp, or a few transistors. Other configurations need to be set to a "known state."

Usually, if the power goes away the information goes with it.

Does that help?
 
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