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How A Smartphone Knows Up From Down

Ever wonder how your smartphone knows when you've tilted or swung it around? The secret is in some microscoping silicone etching.

Bill takes apart a smartphone and explains how its accelerometer works. He also shares the essential idea underlying the MEMS production of these devices. This video is based on a chapter from the EngineerGuy team's latest book, Eight Amazing Engineering Stories. Learn more at

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