Cheap 6+ Axis Acc/Rate w/I2 interface, < $60 WII Nunchuck and MotionPlus
The Wii nunchuck has 3 axis accelerometers. It talks thru an I2 interface, and the whole unit can be had for $18. The Wii MotionPlus has a two axis rate sensor (tuning fork) and is reported to be very accurate by gamers for another $18. Get two for 3
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