运用PID调节器，实现直流电机在带动负载的情况下也能稳定的运行。运用A/D转换芯片将滑动变阻器的模拟电压转换为数字量作为控制直流电机速度的给定值；用压控振荡器模拟直流电机的运行（电压高-转速高-脉冲多），单片机在单位时间内对脉冲计数作为电机速度的检测值；应用数字PID模型作单片机控制编程，其中P、I、D参数可按键输入并用LED数码显示；单片机PWM调宽输出作为输出值，开关驱动、电子滤波控制模拟电机（压控振荡器）实现对直流电机的PID调压调速功能。-Use of the PID controller, to achieve stable operation of the DC motor to drive the load. The use of A/D converter chip analog voltage conversion of the sliding rheostat for digital control of DC motor speed for a given value　the operation of the voltage-controlled oscillator analog DC motor (high voltage- high speed- multi-pulse), the microcontroller in the unit count as a motor speed detection value of the pulse time　MCU control programming of application of digital PID model, where P, I, D parameter can be the key input and with LED digital display　microcontroller PWM width modulated output as the output value, the switch driver, electronic filtering control the simulated motor DC motor speed control function of the PID regulator.