To make Angry Birds a real sport, Mbed made a USB slingshot to play Angry Birds. The slingshot emulates a USB mouse, so it really is a plug 'n' play. It translates the physical use of the slingshot in to appropriate mouse controls. The way the controller works is reasonably simple: a stretch sensor translates the drawing of the slingshot to a mouse movement and an accelerometer determines the angle. Check out the video of it in action.
Source / By Ben on Fri Mar 2 2012