Sensor to tell me when something looses power

[ogiewon]

This thread may offer you some options.

Power Circuit Monitoring for Power Loss

In a few weeks I am having a sump pump installed in my crawl space because of on going water issues. I have a receptacle in the area of the pump that is tied into a GFIC outlet. For obvious reasons I want to be notified if this outlet ever loses power. I saw @Cobra and @Navat604 old posts on the ST community Curious if these solutions are still working or if there are better ideas. @Navat604 what relay did you use in your contact sensor? It is very small and appears like you have it in…

And here is another idea that I came up with...

Simple Power Outage Detector

Have you ever wanted a very simple method to monitor is a certain power circuit has lost power? Perhaps a GFCI circuit with a garage freezer on it? Or maybe you're Hubitat Hub is on UPS, and you'd like to know if the power went out in your house so you can safely shut down your hub before the UPS dies? Whatever the reason, I think I have stumbled upon a very simple, low cost solution. A friend of mine came up with an idea to use a RPi to ping a USB-powered ESP8266 connected to his WiFi netwo…