this post was submitted on 23 Sep 2024
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I wish someone made a smart door lock status indicator. I don't want my doors to unlock for me; I just want to know if I remembered to lock them.
Like you want to have a dumb lock but a smart sensor that tells you if the deadbolt is locked or open?
I remember reading some blog somewhere about a person who rigged up a sensor to alert them if their mailbox had been opened or not, you could probably design something to do similar. Idk maybe a magnetic thing to detect the bolt itself, or something to detect on the position of the latch on the interior of the door?
Found this after a quick search, sorry for it being Reddit and the video of the working solution being uploaded to gfycat.
Dumb Deadbolt Lock Detection - Reddit
It wouldn't be hard to do if I got a hall sensor, I just didn't want to have to mess with 3D modeling and printing a housing for it.
I wonder if contact strips could be glued to the sides of the thing the deadbolt goes into?
That's definitely one way to approach it. You wouldn't have to attach something to the door that way, but you'd have to mess with wires external to the device.
The ones I saw from Cisa, aside from reporting the status, could automatically lock every time you closed them
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.