利用单片机控制直流电机，掌握脉宽调制直流调速的方法。通过调节脉冲宽度，改变占空比，从而改变输出，达到改变直流电机转速的目的-The use of single-chip microcomputer to control the DC motor, pulse width modulation DC speed regulation method. By adjusting the pulse width, changing the duty cycle, thereby changing the