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。-The DC motor PWM speed controller master chip AT89C51, the use of LED digital tube display unit, interactive interface, the use of stand-alone keyboard, motor drive circuit L298. The DC motor PWM speed control device to achieve forward, reverse, stop, and can display real-time rotation turns.