“MicroGen’s energy harvester, dubbed Bolt, provides power like a battery — but uses a very different means to get there. Housing a piezoelectric microelectromechanical system (MEMS) inside the casing pictured above, the unit creates energy from vibrations in the surrounding environment. Ambient vibrations cause a flap on the device (pictured below) to move back and forth, which in turn creates a current that dumps energy in to either a capacitor or a thin rechargeable battery next to the flap. The Bolt requires a source vibrating at around 120Hz in order to charge, and an LED on the outer casing will blink to let you know it’s full.”

http://www.extremetech.com/computing/155102-energy-harvester-that-creates-power-from-ambient-vibrations-finally-comes-to-market

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