设计以89C51单片机、ADC、DAC等电路和运放电路组成的被控对象构成的单闭环反馈控制系统。 1. 硬件电路设计：89C51最小系统加上模入电路ADC0809和模出电路TLC7528；由运放构成的被控对象。 2. 控制算法：增量型的PID控制。 3. 软件设计：主程序、定时中断程序、A/D转换程序、滤波程序、D/A输出程序、PID控制程序等-Design 89C51 microcontroller, ADC, DAC and op amp circuits such as circuits composed of single-charged objects constitute the feedback loop. 1. Hardware Circuit Design: 89C51 minimum system model into the circuit with a circuit model ADC0809 and TLC7528　by the op amp form of controlled object. 2. Control Algorithm: Incremental of PID control. 3. Software design: the main program, timer interrupt program, A/D conversion process, filtering process, D/A output process, PID control procedures