Design of motor speed-measuring system based on the incremental photoelectric encoder

The motor speed measuring system based on incremental photoelectric encoder was designed using photoelectric encoder as the component for motor rotating speed. In this system, the output pulse of photoelectric encoder was reshaped by Schmitt triggers, then MCU gathered the signal and calculated the rotating speed value, the motor rotating speed and direction were displayed by the LCD, measurement cycles were set by keyboard and speed measurement algorithm used M/T method. The measurement system had the characteristics of high precision and real-time display, suitable for motor speed-measuring at runtime with smaller vibration.