Arduino board programmed with an audio file
T.C. Sottek, theverge.com

Pro­gram­mer Mike Tsao has devised a clever method to pro­gram an Arduino board using sound. It’s called TribeDuino, and it uses the Arduino’s audio sen­sors to detect the time elapsed between peaks of sound — short peri­ods are inter­pret­ed as…

Well that’s nifty.