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HOW TO – Make a RGB combination door lock

HOW TO – Make a RGB combination door lock

Hack-a-day has a great how to on making a RGB combination door lock – thanks Wil!

Putting a custom designed electronic lock on your space seems like a geek right of passage. For our latest workspace, we decided to skip the boring numbered keypad and build a custom RGB backlit keypad powered by an Arduino. Instead of typing in numbers, your password is a unique set of colors. In today’s How-To, we’ll show you how to build your own and give you the code to make it all work.

The basic design for the RGB keypad came from [JMG]’s Arduino based Monome clone. He used an Arduino, and multiplexed RGB LEDs with some digital potentiometers to create a color mixing keypad. Since we couldn’t fit the complete 4×4 keypad into a standard 2 gang wall box, we chopped the design down to a 2×4 matrix. This cuts down significantly on the cost to build the keypad and makes the code that much easier to digest.

4 thoughts on “HOW TO – Make a RGB combination door lock

  1. Aud1073cH says:

    This project uses an electronic door lock to grant access after correct button pushing.

    Hackaday also posted this:

    a magnetic lock pick to defeat just such a lock.

  2. new locker says:


    Electronics is always booming…no world with out electronics.RGB color used bcoz opticle is very fast compare to other electronics system…new locker

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