Rotary encoder

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In computer input terms, a rotary encoder is a device which measures the rotation of a roller or wheel so that the host device may relay this back to the computer.

The best-known implementation is that of a finely-spoked wheel flanked by a pair of LEDs and photo-diodes. Through this arrangement, the electronics detect the rotation of the wheel as the flanges alternatively cut the light beams. This is the standard implementation of the axis rollers in opto-mechanical pointing devices.

Gallery

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  Side view of volume control encoder

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  Opto-mechanical rotary encoder in a computer mouse

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  Alps electromechanical rotary encoder in a Key Tronic Professional Series Mouse