"Pete Cross" 1@2 wrote in message ...
I bought 12v linked detectors and wired them into our house alarm on the
24hr loop.

Interesting idea. I was actually thinking of the actual sensor housing
having a PIR as well as a smoke detector. Also using the same wires.

Wouldn't you want a different siren for smoke? With a burglar alarm you run
into the house and lock the doors... and the other, you run out...

Colin