Building a custom designed electronic lock seems like a geek right of passage. In this case, we’ll build a red-blue-green color combination lock. Instead of typing in numbers, your password is a unique set of colors. In today’s how to, Hack-a-Day shows you how to build your own. This detailed tutorial takes you step by step through the entire build process. For more LED projects, be sure to check out our LEDs and Lights section. View part 2 of this tutorial.