Optical rotary encoders !！

Rotary encoder is used to measure the speed and with the PWM technology can achieve rapid speed control device, photoelectric rotary encoder through photoelectric conversion, the output shaft angular displacement, angular velocity and other mechanical quantities into the corresponding electrical pulse to digital Output (REP).
Divided into single output and dual output two. Technical parameters are the number of pulses per revolution (dozens to several thousand have), and the supply voltage and so on. Single output refers to the output of the rotary encoder is a set of pulses, and the two-output rotary encoder outputs two sets of A / B phase difference of 90 degrees pulse, through the two sets of pulses can not only measure the speed, you can also determine the rotation Direction.

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