Sensing an interconnected smoke alarm system

[Barkis (John C)]

A number of folks have done this. My alarms are Kidde and I used a variation of what’s described in the following link.

Integrating Kidde Smoke / CO Sensors into SmartThings Properly

I’m sure this has been done before but I know I’ve seen lots of discussions on the best way to integrate existing smoke/CO sensors into SmartThings. After lots of research I did what I thought was the best way for my situation and figured I’d write up what I did in case it could help someone else. Cost me less then $100 and about 6 - 8 hours of work, probably less if I didn’t write this up and take pictures. The way I did it also does not interfere with the existing sensor operation which was my main concern. My house was built two years ago and has sensors to meet code. That means smoke in each of the three bedrooms, a combination smoke/CO in the upstairs hallway, a smoke in the first floor hallway near the kitchen, and another smoke in the basement. They are all Kidde brand and int…

No doubt a similar relay is available for your First Alert alarm. I found mine on Amazon, YMMV, of course!

You might also find the following list of ideas & projects useful in your exploration…

http://thingsthataresmart.wiki/index.php?title=How_to_Quick_Browse_the_Community-Created_SmartApps_Forum_Section#Quick_Browse_Links_for_Project_Reports.2FQuestions

Lots of ideas there!