Ultrasonic Transducer - scanlime:011

This video takes a close look at those little chirping sonar cylinders that might have helped your robot avoid bumping into furniture. They're sort of like a microphone or a speaker, but looking closer they seem more like a tiny tuning fork with a hat.

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http://amara.org/v/IKCo/

Видео Ultrasonic Transducer - scanlime:011 канала scanlime