Hot answers tagged alarm
Most security system have a minimum of 9v DC, but I've seen up to 60v AC or DC, running to the sensors. The concern here is voltage drop as these are extremely low current devices. If you are using magnetic/reed switches, which it sounds like you are, they are unpowered digital switches (either on or off). Digital logic circuit typically require >50% of the ...
Have a look at Iris. You can mix and match components such as door/window sensors, thermostats, motion sensors, etc. It hooks to your wifi and can send you text alerts.
Only top voted, non community-wiki answers of a minimum length are eligible