DIY Sonar for the Blind
This is one of those simple concepts which makes you think “Why didn’t I think of that?” The entire sonar unit is attached to a wearable glove and as the user sweeps their arm back and forth, the device can detect anything from one inch to 10 feet in size.
Two servomotors apply pressure to the top of the hand when obstructions are detected. The closer the object is, the more pressure is applied. The response time is in milliseconds, allowing a blind person to navigate easily around obstacles or find items on a table, for example.
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[original story: Hack n Mod]