If you are looking to build a simple ... door, the reader grabs the code and the Pi compares it with a list of authorized users. If the card is on the list, the Pi triggers the door lock using ...

He calls the project “simple and cheap ... so [Giorgos] disassembled his door’s locking mechanism to see how he might be able to actuate the lock electronically himself.

$148 from Amazon The Yale YRD256 Assure Lock SL has an excellent interface that makes it simple to use ... and a feature that automatically locks the door behind you. It can hold up to 25 unique ...