本直流电机PWM调速器主控芯片采用AT89C51，显示部件采用LED数码管，人机交互接口采用独立式键盘，电机驱动电路采用L298。该直流电机PWM调速器能实现电机正转，反转，停止，并能实时显示转动的圈数。-PWM DC motor speed controller of the master chip AT89C51, with LED digital display unit, interactive interface with separate keyboard, the motor drive circuit L298. The DC motor PWM speed controller to the motor forward, reverse, stop, and can turn real-time display the number of laps.