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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 ,

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

$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

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.

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/