说明：  　　　采用单片机作为控制核心，实现对步进电机的加速、减速、停止、正转、反转的控制。单片机设定所需脉冲值，计数器测得步进电机的实际转速。单片机过比较设定脉冲值与实际反馈值比较，经PID算法得出控量。单片机根据输出控制量，改变脉冲输出个数，从而控制电机，并在LCD上显示步进电机的转速、方向。
(Using SCM as the control core, the stepper motor acceleration, deceleration, stop, forward, reverse control. Microcontroller to set the desired pulse value, the counter measured the actual speed of the stepper motor. Microcontroller is too set the pulse value and the actual feedback value comparison, control the amount derived by the PID algorithm. Microcontroller according to the amount of output control, change the number of pulse output, so as to control the motor, stepper motor speed, direction and displayed on the LCD.)