I’m hoping to make a bolt-on actuator to turn my (or any) deadbolt into a smart lock. My plan is to combine a Wemos D1 Mini with an ATtiny Arduino chip and a small, efficient servo motor. It would all be powered by 2-4 rechargeable AAA or AA cells (or a 9V if that’s called for), housed in a 3D-printed enclosure and mounted using the screw holes that attach the (interior) deadbolt lever/plate to the exterior key plate.
I want to keep this as small as possible (to keep the wife happy) and I’m hoping it will go several months before the batteries need to be recharged. (The longer the better.) I hope to incorporate a a low-power notification into the firmware and a charging circuit with a DC power fitting so I can just plug in a DC power supply to recharge the batteries overnight when the batteries get low.
I’m primarily looking for recommendations on a motor that’s as small/efficient as possible while still having the torque to get the job done - but I’m also open to input on any other aspect of the project/design. Thanks for your time and consideration.
