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Encoders: Sensor used to measure RPM of any motor. It uses photo couplers as make working mechanism. Easiest way to get closed loop speed control using Variable speed ,

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$17.85 (Buy here: https://alitems.com/g/1e8d114494ebda23ff8b16525dc3e8/?i=5&ulp=https%3A%2F%2Fwww.aliexpress.com%2Fitem%2FHobbyWing-UBEC-8A-6S-for-RC-R-c-Aircraft-Motor-Electronic-Speed-Controller-ESCFreeshipping%2F32650771866.html ) HobbyWing UBEC-8A-5S for RC R/c Aircraft Motor 5V 6V / 8A Max 15A 2-5S Lipo UBEC Freeshipping for just $17.85

Helios 1 Amp Electronic Speed Controller ESA/U 1 - https://lostparcels.com/parcel-company-3/uncategorized/helios-1-amp-electronic-speed-controller-esau-1/

Love the shapes this cheetah makes as he runs. I've seen this picture before, and so I don't know which is the original. From Source: Controle Eletrônico de Estabilidade

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One bladed drone is slightly off center and spins 800 rps, body spins 40 rps in opposite direction. Control is by adjusting speed of blade. http://rotordronemag.com/quarter-size-drone/

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Harmonia, Best Range Hood Stainless steel and glass come together in Harmonia, a chimney-venting range hood whose minimalist design and touch-free control panel suit it for open-plan spaces. The four-speed, electronic, infrared heat-sensing unit uses the company’s blower system to remove heat and odor. The control dashboard senses the location of a user’s finger without requiring direct contact.

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