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HomeKit DIY lock sensor

HomeKit DIY lock sensor

I don’t really trust the IoT stuff enough to install smart locks yet (and my doors are weird enough right now that it probably wouldn’t work well anyway). However, it would be great to know if any of the doors have been left unlocked. Can anyone think of a small sensor that could determine, for example, the position of a latch and / or latch and could somehow expose it to the system?