Make smoke alarm smart

  • Re: Nemaxx smoke alarm WL2

    Found this old post and wanted to reply, but it was too old, so I'll create a new.

    Very interesting post. I have similar smoke alarms and plan to add Fibaro smart implant to detect alarm activation in my home center whenever one of them are triggered. What I managed to do so far is detecting the alarm activation of one single smoke detector by connecting my implant to its P64 pin as @freynder mentioned. But it doesnt trigger if I interconnect all detectors together and activates one of the other detectors. Is there another pin which detects the interconnection and how did you manage to analyse PCB, finding which chips and pins are relevant?

  • @vuninho . I've experimented using a basic sound detector to identify the frequency (3.1 kHZ) of smoke alarms beeps. The approach is non invasive, not requiring any mods to smoke alarm, and seams to work with most types. It uses a software algorithm called Fast Fourier Transform that you can find libraries for Arduino's, and only requires a few components. Testing shows it was able to identify the beeping of a smoke alarm over 35 feet away, with average background noise in my house. Here's the link to my post that describes the technique if you're interested. .

  • Brilliant and thanks for reply.
    By the way, I found out which pin was activated when they are interconnected. Setting this all up seems to trigger my home center nicely, and I'm able to roll up all my blinds whenever alarms are detected. 🙌

  • You can check out this project:

    It can be used as a smoke and alarm and sensor, as well as to monitor other air quality parameters such as carbon monoxide and flammable gases.

  • Banned

    Is it similar in nature to a temperature alarm?

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