Outlet power sensor

[aaiyar]

@user6131

I can't find a sensor that will alert me change in the power to the outlet,

It is so easy to build one. Just look at this thread for instructions:

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…

It cost me about $20 to build one. Once you have it built, plug your lamp into one outlet of the receptacle, and the power monitor into the other.

Flip the switch; the power monitor will change status, and you know your lamp is either on of off, depending on whether you flipped the switch on or off.

I’m not saying that you shouldn’t install a smart switch - in fact I think that’s a cleaner and more useful approach. But it is totally possible to build a power monitor that does exactly what you want.