本设计以AT89C51单片机为核心，以4*4矩阵键盘做为输入达到控制直流电机的启停、速度和方向，完成了基本要求和发挥部分的要求。在设计中，采用了PWM技术对电机进行控制，通过对占空比的计算达到精确调速的目的。-The design AT89C51 microcontroller as the core, 4* 4 matrix keyboard as input to control DC motor start-stop, speed and direction, completed the basic requirements and to play some of these requests. In the design, using a PWM technique to control the motor, through the calculation of duty cycle to achieve accurate timing purposes.