Motorised key turner for smart door lock

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