this post was submitted on 23 Sep 2024
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HomeAssistant can do this. Set an automation when you leave your home zone, if door is unlocked notify you.
If you have a smart lock, you can even close it. You should get cameras and an alarm system first, though.
How do you detect this condition without a motorized smart lock?
Hall sensor or a switch that gets pressed when the lock is locked.
How did you integrate this into your door reliably without interfering with the regular lock mechanism?
You could position the sensor/switch on one of the cardinal directions so it wouldn't be in the way of the mechanism.
Mind sharing a photo of how you did this?
I haven't actually done this, I was just brainstorming. It shouldn't be too hard of a project, though. The easiest would just be an esp32 chip, limit switch, and small battery and power circuit.
You position the switch were the deadbolt latch hits it in the open or closed position (I'd do open personally). Using esphome with homeassistant would make programming it a breeze.
You'd need to figure out a housing, which is why I wish there was an off the shelf product. I might design one eventually, but it shouldn't be a huge lift for anyone who is familiar with 3d modeling.