Hi @GlennA. The sensors appear to be purely mechanical spring-loaded push buttons (not reed). They are made by Sentrol and look very similar to the picture below i.e., not very ‘smart’. There are 4 of them, and are fed by 2-wire cables each. I just checked with a multi-meter and the resistance is very large when the doors are open (switch not pressed) and very small when the doors are closed (switch pressed).
There are also 3 PIR motion sensors, and those are fed by 4-wire cables. I just broke one while trying to remove it, so might be a good idea to replace them all. The connections say 12V DC, but I just measured and it’s near 13.5 V. This will likely change if I get a totally new controller/board. The box/board is an ADT system (pictures below). I initially thought there were switches for the windows but no, I checked and there were none. The system is about 18 years old and due for a face-lift. So, moving forward, here is what I’d like to do:
- Re-purpose/re-use the door switches (or at least their wires), might even replace the switches with something more modern if needed.
- Install wireless switches for the windows
- Replace the main board, downstairs in the basement.
- Replace the main control keypad (near the entrance door), used to arm/disarm the system.
- Also replace the PIR sensors, most likely there is newer/better technology today.
Appreciate the help.
