针对电机的转速进行测量，然后用数码管把电机的转速显示出来！光电测速部分主要由光电传感器构成！脉冲处理部分主要经施密特触发器对接收到的脉冲进行波形校正，由单片机的T1口输入，经80C51处理后显示输出电机的转速.-Measurements for motor speed, and then use the digital control of the motor speed is displayed! Photoelectric tachometer part is mainly composed of photoelectric sensors! Pulse by pulse processing part Schmitt trigger the received waveform correction, by the microcontroller T1 port input, the motor speed display output after 80C51 treatment.