[Maybe?] Technology Project Idea: Secret Knock Drawer Lock [Adafrut Learning System]

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Link: Secret Knock Activated Drawer Lock | Adafruit Learning System

 

Disclaimers:

 

As always, read and understand this guide completely before starting the project.

 

The project is for fun. Don't use it for serious security or to lock people inside of anything.

 

http://www.youtube.com/watch?v=vgSRUXBKhEs