Motorised key turner for smart door lock
thingiverse
The main assembly is securely fastened onto the door lock/handle frame. The stepper motor utilized is a Daypower S-SPSM-5V model. A small gear is precisely fitted onto the motor, while a larger one is fixed firmly to the key. Due to the requirement for the key to remain inside the lock at all times, it's essential to have a lock equipped with an emergency function that allows unlocking from the outside even when the key is inserted from within. Additionally, a piece of drivebelt is necessary; I simply repurposed a leftover piece from my 3D printer. Determine the correct length and attach it to an endless loop using epoxy or a similar adhesive material. Stepper Motor with Driver: https://www.pollin.de/p/schrittmotor-set-daypower-s-spsm-5v-310543
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