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

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.

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.