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Make: Sensors by Ville Valtokari, Kimmo Karvinen, Tero Karvinen

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Chapter 3. Distance

The two most common ways to measure distance are sound echoes and light reflection. To avoid annoying people with constant beeping and blinking, the sound frequency is usually so high that humans can’t hear it, and the light frequency is so low humans can’t see it. The high-frequency sound is ...

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