Project: Secret Knock Detecting Lock

By Steve Hoefer on Saturday, May 15, 2010

The Secret Knock Detecting Lock unlocks your door when it detects the correct knocking sequence. It's the perfect accessory to your secret lair, club house or tree house. It has gotten worldwide attention and the video has been seen well over half a million times. A ton of people have been inspired by this project and expanded and adapted it. Its simplicity and cleverness has also encouraged thousands of people to get started exploring the world of microcontrollers.*

Watch the video.

How To:

Instrucables (detailed step-by-step instructions)
Grathio.com (Video, build log, parts list, schematics, and code.)
Secret Knock Detecting Gumball Machine, built around the same base, but with more candy.

Sightings: Real Life:

Read More...
http://projects.grathio.com/2010/05/project-secret-knock-detecting-lock.html