基于89C51单片机的直流电机控制与显示系统设计。程序主要实现的是用PWM调速方式控制直流电机转动的速度，以及正反转和延时关闭等功能，另有4位数码管显示实时转速。自带proteus仿真，课程设计说明书，源程序。-Design of DC motor control and display system based on 89C51 single chip microcomputer. The main implementation of the program is to use PWM to control the speed of DC motor rotation, as well as the positive inversion and delay time off and other functions, and another 4 digital tube display real-time speed.