Magic Mouse - the future of computer control

5 WPI undergraduates designed a 3D computer mouse you wear as a ring on one of your fingers. The MagicMouse on the basis of ultrasonic allows 3-Dimensional Computer Navigation: You can move the cursor by moving the ring-wearing finger, if you want to zoom just move your hand closer to the screen.

For detecting the fingermovement, the GPS technique is used: time difference of arrival (TDOA). Every 16 milliseconds, five receivers detect ultrasound waves emitted by a transmitter worn on the finger. Differences in the time it takes the sound waves to reach the receivers are translated into the distance between the transmitter and each receiver. The students wrote a software which computes this operation.
Surprisingly, the complex device uses the Plug&Play technology, no drivers are needed.
Maybe in a few years we can play our games using this nice gadget.