"Secret Knock" Detecting Door Lock

     Many students at college have a really hard time keeping up with their keys or even locking there keys in their rooms. A good solution to this would be the "secret knock" detecting door lock. This device would allow the user to program a secret sequence of knocks for the Arduino to listen for. When the correct sequence of knocks is obtained, the Arudino will then send power to a servo attached to a door lock, thus unlocking the door. The main purpose of this would be just a cool project that college students could use instead of keys.

This is a sample of a "secret knock" detecting door lock.

     This project only requires a handful of hardware components. These components include LED's, a Piezo element, a push button, a servo, and of course, a door and lock.