Sure, your Arduino project can make a stuffed monkey dance, but is it really doing anything for the greater benefit of mankind. Okay, maybe - but not to the same degree as Grathio Labs' Tacit glove, an Arduino powered sonar device that can help the vision impaired navigate foreign environments. This wrist-mounted gauntlet is comprised of an Arduino microcontroller, a few ultrasonic sensors, and a pair of servomotors to apply variable pressure to the user's wrist to indicate their distance from an object or obstacle.
Engadget, Tacit sonar gauntlet gives the blind ultrasonic eyes (video)
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