In SX Microcontrollers, SX/B Compiler and SX-Key Tool, edgellmh wrote:

I want to determine whether house power is on at a remote location. The microcontroller whose job it is to do this will be powered by a UPS. Presumably I need some kind of relay but it is unclear to me what kind of relay and how to sample the ac power. If I use a power cube  to put a low voltage onto a relay then what I am detecting is whether or not the power cube is working. Is there a way a more direct way to sample the AC power?

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