1摘要现如今，人们对生活的态度和生活方式变得不同,，不仅私家车成为了人们最普遍的交通工具，大多数人都有自己的私家车,而且人们对酒精的消耗量也越来越大，这些就导致酒后驾车行为越来越普遍，酒后驾车意外越来越频繁，涉及到的领域不断扩大，对社会的影响也不断增大。酒精麻醉神经、使人大脑神经系统紊乱、身体不协调、身体难以自控等等，最终很容易造成事故。因此本设计就非常有必要、非常具有现实意义，有了这个酒精浓度检测仪就能更好地对酒驾进行行为进行检测及控制。本设计可以实现检测和显示不同浓度的酒精，而且体积小便于随身携带，非常适合人们自行检测和交警工作等，方便又安全。这个设计在STC89C51单片机的控制、指导下，通过气体传感器MQ-3对外界的酒精浓度进行响应,然后传感器产生电阻变化，形成电压信号即模拟信号，A/D模数转换器将此信号转换成数字信号，并且将其转存起来，最后由LCD显示酒精密度。关键词：酒精浓度传感器（MQ3）；STC89C51单片机；A/D模数转换器；LCD1602液晶显示器2AbstractNowadays,people'slifeattitudeandlifestyleisdifferent,andnotonlyprivatecarsbecamethemostcommonmeansoftransportation,peoplemostpeoplehavetheirowncars,andpeopletotheconsumptionofalcoholisbecomingmoreandmorebig,thebehaviorleadstodrunkdrivingisbecomingmorecommon,drunkendrivingaccidentismoreandmorefrequent,'ssphereismoreandmorebroad,andtheimpactonthesocietyismoreandmorebig.Thealcoholanesthetizednerve,causesthepeopleofthepeople'speople'sbraintobenervoussystemdisorder,thebodyisnotcoordinated,thebodyisdifficultself-controlandsoon,itisveryeasytocauseanaccident.Sothisdesignisverynecessary,veryrealistic,withthealcoholconcentrationdetectorcanbetterfordetectionandcontrolofdrunkdrivingbehavior.Thisdesigncanachievedetectionanddisplayofdifferentconcentrationsofalcohol,smallvolumeandeasytocarry,verysuitableforpeopletodetectandpolicework,convenientandsafe.ThisdesignisinSTC89C51singlechipundertheguidanceofMQ-threeoftheworldthroughAgassensordetectalcoholconcentration,andthenproduceresistancechange,formAvoltagesignalthatisanalogsignalA/Danalog-to-digitalconverterconvertsthesignalsintodigitalsignals,andrippingitup,finallybytheLCDdisplayalcoholdensity.Keywords:Alcoholconcentrationsensor(MQ3);STC85C5MUC;A/Dconverter;LCD3目录引言...........................................................61.绪论.......................................................81.1酒精浓度测试仪的开发背景.........................................................................................81.2酒精浓度检测仪的现状及发展趋势............................................................................81.3酒精浓度检测仪设计内容及论文介绍........................................................................91.4本章小结.....................................................................................................................102系统总体方案设计............................................102.1设计总方案简介..........................................................................................................102.2元器件的确认..............................................................................................................112.2.1单片机...................................................................................................................112.2.2传感器....................................................................................................................112.2.3模数转换器........................................................................................
