Anacostia Community Museum Campaign button - "It's Better Live..." Anacostia Community Museum Pinback Button, Humphrey-Muskie Presidential Campaign Anacostia Community Museum Pinback Button, Harold ...

This is a full-color clone of the monome interface; a 4×4 grid of buttons with tri-color LEDs underneath. Each LED has 24bits of color control, for more than 16million color combinations.

But if you just want to add in some buttons without reaching for an extra IC you’ll love this hack. [John Boxall] shows how to add four buttons using one ADC pin. The concept is nothing new.