Roundss Optical Rotary Encoder.！

Rotary encoders are electromechanical devices used for sensing in myriad applications — on motors paired with drives and automated machinery for everything from consumer electronics, elevators, and conveyor speed monitoring to position control on automated industrial machines and robotics. They track the turning of motor shafts to generate digital position and motion information. Whether incremental or absolute, magnetic or optical, rotary encoders track motor shaft rotation to generate digital position and motion information.  Their use proliferates in industrial and commercial designs.

An incremental encoder produces a series of square waves as it rotates. The number of square wave cycles produced per one turn of the shaft is called the encoder resolution. Generally, incremental encoders provide more resolution at a lower cost than their absolute cousins. They also have a simpler interface because they have fewer output lines.

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