Motorised key turner for smart door lock
thingiverse
The main part is mounted onto the door lock/handle frame. The stepper I used is a Daypower S-SPSM-5V. The small gear fits on the motor, while the bigger one is fixed on the key. Because the key is required to be inside the lock, you will need a lock with "emergency function" so you cann still unlock it from the outside while the key is pluged in from the inside. Also you need a piece of drivebeld, I just used a remaining piece from the 3D printer. Figure out the correct length and glue it to an infinte loop with epoxy or similar glue. Steppermotor with driver: https://www.pollin.de/p/schrittmotor-set-daypower-s-spsm-5v-310543#
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