本设计采用AT89S52单片机为主控制器设计出一种基于PWM波控制直流电机的调速系统，通过微机和驱动电路可以实现电机的正反转，加减速调整-This design uses AT89S52 microcontroller-based controller design based on PWM wave control DC motor speed control system, through the computer and the drive circuit can be achieved