基于单片机的酒精测试仪

Alcohol Testing Instrumment Based on Single-chipMicrocomputerAbstractAlcohol has the effect of brain paralysis,will lead to drinking the probability of driving accidents increased greatly,resulting in more and more tragedy,and the resultsare irreversible.In order to reduce the occurrence of these tragedies,it is necessary and meaningful to design a simple and complete instrument to detect the alcohol contentin the exhaust gas.STC89C51 SCM and MQ-3 sensor are the core of the design,designed the display,sound and light alarm,key and other related circuits.The function of each module is analyzed concretely,and the core device is studied emphatically.This system has detection,alarm,display and other functions,with low cost,easy to carry,human characteristics,so high practicality,there is great room for development.Key words:STC89C51 single chip microcomputer;MQ-3 sensor;A/D converter