this post was submitted on 15 Sep 2024
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What device can rotate a knob and works with HA? (feddit.it)
submitted 1 week ago by Moonrise2473@feddit.it to c/homeassistant@lemmy.world
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I was accidentally locked out of home again, and I had to call a professional to open the lock.

But if someone was home, they could have just turned the knob of the door from inside. There's a device that can do that? It needs to do 3 full turns and it requires a bit of force to do that (armored door with iron bars that slide in every direction, so it has a big inertia to start)

I saw a ready solution on a store, the iseo x1r, but that costs 1000 euro + another 200 for the gateway (not mandatory but otherwise it uses proprietary Bluetooth protocol and so it can't talk with HA

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[–] AbidingOhmsLaw@lemmy.ml 6 points 1 week ago (10 children)

If you have some electronic skill you can use espHome on a esp32 microcontroller to control an RC Servo motor.

https://esphome.io/components/servo.html

If you want out-of-box there are several electronic locks that will work.

https://community.home-assistant.io/t/smart-locks-compatible-with-home-assistant/590662

[–] Prunebutt@slrpnk.net 4 points 1 week ago* (last edited 1 week ago) (5 children)

RC Servo motor

My guess is that a servo will probably be a bit too weak for that. They'll propably need a stepper motor.

[–] AbidingOhmsLaw@lemmy.ml 1 points 1 week ago* (last edited 1 week ago) (1 children)

Depends on the lock being actuated and the torque of the servo, I have some that can do 4.4 N-m.

https://www.amazon.com/high-torque-servo/s?k=high+torque+servo

A stepper motor would also work for sure.

[–] Prunebutt@slrpnk.net 1 points 1 week ago

TIL about high torque servos.

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