4、 paper studies has been designed for public inspection and overrun alarm function with the alcohol concentration intelligent tester. Its design scheme based on 89C51, MQ3 alcohol concentration sensor. System will sensor output signal through the A/D circuit recuperati
5、on, data processing byMCU, finally by LCD display alcohol chroma value.Thispaperdescribesthedataacquisitionsubsystem,dataprocessinganddatadisplaysubsystemandalarmcircuitdesignmethodsandprocesses.Systemrequirementsforthesamplingsitesexceedingthealcoholconcentrationdiod
6、ereminderalarmcircuitmonitors.Meanwhile,theoperatorspecificalarmpointfortheupperlimitsetbyMCUprogramming.Alcoholtesterwillbringadrivingsignalpriortoasafe.After a great deal of verification, based on SCM alcohol concentration monitor detector than traditional mechanica
7、l detector or alcohol plans, monitoring high precision, sensitivity, good dependability, precise convenient extended simple, control powerful functions. Beyond the value of acousto-optic alarm, intuitive accurate. So based on SCM alcohol concentration monitor research
8、 has certain value. . Keywords: Alcohol concentration sensor microcontroller digital-to-analog Hardware design
