Feature request: heat detector support about homebridge-rpi HOT 4 CLOSED

I’m happy to create a smoke device to have it exposed to HomeKit as Smoke Sensor, but the tricky part (for me) is how the detectory connects to the Pi. I don’t think HomeKit defines heat sensors. Also, they haven’t yet cracked the history for the Eve Smoke, afaik, so (initial) support will be without history.

Do I understand correctly that it just uses a binary input GPIO signal that is active to indicate the alarm? Did you already hook it up to the Pi? Can you try and expose it as a contact device and see if Homebridge RPi detects input changes when the detector fires?

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Yes, heat sensors use a binary input GPIO signal. I've tested it as a contact device. It's normally opened (no fire). It should changed to close when detecting fire. The detection method is based on the spring action of a metal contact, held to the metal chamber by a fusible alloy. When the temperature reaches the alloy’s melting point, the metal contact will depress the diaphragm, causing the electrical contact to close the circuit. It's non-resettable, and cannot be tested unfortunately.

I agreed that exposing heat sensors as smoke devices would work. Both sensors detect the same hazard in different ways.

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In v1.1.14.

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Verified! Closing this feature request. Thank you so much!

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