Hacking into older wired Intercom system possible?

[ritchierich]

You could try a SPDT relay that is hooked up to a contact sensor with external terminals (or I soldered my wires to the board). You can read about my project here:

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…

Basically I have a USB brick plugged into an outlet that provides 5V output to a relay. When power is cut the relay changes state NO vs NC and the contact sensor detects that and via HE can perform an automated action. Thinking you can buy a 15VDC relay and do something similar.