[UPDATE] Warioduino goes FAMOUS: The warioduino project was featured in MAKE and Kotaku!!!
I wanted something nice to have at the office that would tell us every time someone makes a purchase on our game. Every time we make a buck Wario rings the bell and flashes his greedy green eyes. If we make a lot then Wario shoots smoke from his ears!
With the help of Helena and her Wario, a bike bell, a couple of green leds, a servo, and a little smoke machine I took out of a RC tank. All controlled by Arduino using transistors, and a relay for the smoke machine heating element.
A processing applet checks every minute transactions and sends the results to the Arduino wireless using Xbee.