基于51单片机的MQ-3酒精浓度检测 数字输出量 门限阈值 报警作用-Based on 51 single chip MQ- 3 alcohol concentration detection digital output threshold threshold alarm function

采用MSP430F149内部的比较器，将外部输入信号比较为方波，比较门限为0.5*VCC，也可将两个输入口的信号进行比较。-Using MSP430F149 internal comparator, comparing the external input signal is a square wave, comparing the threshold is 0.5* VCC, two input ports can also be compared to the signal.