My weekend project was to integrate my hardwired, inter-connected smoke alarms with Smart Things.
My alarms are made by Kiddie, so I got the appropriate relay for my system (Kiddie SM120x) and the Schlage RS100HC door sensor. I paired the Schlage sensor with the ST hub and it was recognized right away, although I did have to log into the web I.D.E. and change the device type to “Schlage Contact Sensor” to get it report properly. I saved the magnet for the sensor for future projects because it is not needed.
I have access to one of the Smoke Alarms in my basement, so I mounted another electrical box about a foot away and ran 14-3 wiring. I hooked the black (line), white (neutral), red (inter-connect) of the relay to the new wire I ran from the existing smoke alarm. I then hooked the blue (common contact) and yellow (normally closed contact) from the relay to the small terminal screws inside the Schlage sensor (I capped off the other relay wires). I drilled a hole through the side of the plastic case on the Schlage to allow the wires to connect with the cover on. It was tight fit but I got it all into the electrical box (I think I am going to shorten the wires some more on the relay to free up some space).
Now on Smart Things the sensor shows closed until the smoke alarms are activated and then changes to open. I have set-up “Notify Me When” to send an alert that the smoke alarms are active. I also set-up “Turn it on when it Opens” to turn on all of the lights in the house when the alarms go off (should help us get out at night). It has all tested out and works great! Now if I could change the icons from open/closed to something smoke alarm appropriate, it would be perfect.
Kiddie has a separate relay for CO2 alarms so I may do a similar set-up for CO2 detection.