一个基于c语言的51单片机程序，可实现对旋转物体转速的测量，采用对射式光电开关，产生与旋转物体相对应的脉冲信号，以单片机采样脉冲信号，计算每分钟脉冲信号的数目，即电机对应的转速值，通过数码管实时显示电机的转速值；转速测量峰值大于100r/s，实时显示转速。

-Based on 51 MCU c language program, enabling measurement of the speed of rotation of the object, using the beam photoelectric switch, rotating object generates a pulse signal corresponding to the sampling pulse signal microcontroller calculates the number of pulses per minute, ie motor speed corresponding value through the digital display real-time speed value of the motor　speed measuring peak is greater than 100r/s, real-time display speed.