This paper uses Microcontroller,operational amplifier and D/A converter as the core to design digital adjustable threshold voltage comparator circuit.This system is used for alarm system and automatic control.It also designs the circuit hardware and software program and uses protues to analyzes and simulates the circuit system.At last the signal compare threshold is realized.%以单片机、D/A转换器以及运算放大器为核心,设计了一种数字式阈值可调的比较电路,于报警系统、自动控制等领域,并分别对硬件电路和软件程序进行了设计与编写,运用Protues软件对设计的电路系统进行仿真分析.最终实现通过上位机电压数值输入确定电路输出电压值作为信号比较阈值的目的.
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