Power sensor for UPS incase of power outage

[JBrown]

This may give you some ideas.

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…

This is what I use.

Power Circuit Monitoring for Power Loss

I used a Monoprice Contact Sensor KFR-ZD2105US-5, 2N2222 transistor, 220 ohm resistor and a old USB cord. It uses less current than a relay. [image] [image] [image]