Why use old fashioned keys when you can use newfangled electronic keys? If you are looking to build a simple RFID ... door lock using a signal line originally designed to work with an intercom system.

Until several months ago, access to the local was done using 125KHz RFID ... Arduino IDE as ISP and serial headers are available on the board. Finally, an N-channel mosfet controls the door ...

This microcontroller is at the heart of countless impressive projects like RFID door locks, automated plant watering systems ...