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Designed to 89C51 single-chip, ADC, DAC, such as circuit and operational amplifier circuit composed of the object consisting of a single closed-loop feedback control system. 1. Hardware Circuit Design: 89C51 minimum system together with the mold and mold into the circuit ADC0809 Circuit TLC7528 OPAMP posed by the charged object. 2. Control algorithm: PID control of the incremental type. 3. Software design: the main program, timer interrupt procedures, A/D conversion process, filtering process, D/A output process, PID control procedures.