北京信息科技大学本科毕业论文（设计）基于单片机的酒精浓度检测仪设计所在学院专业名称申请学士学位所属学科年级学生姓名、学号指导教师姓名、职完成日期摘要摘要近年来，随着我国经济发展，越来越多的私家车进入了人们的视野，而酒后驾车造成的交通事故也屡屡攀升。本文研究了一种用于公共场所具有检测及超限报警功能的酒精浓度检测仪设计。设计方案基于89C51单片机和MQ3酒精浓度传感器，系统先将传感器输出的信号通过A/D转换电路处理后，再经单片机进行数据处理，最后由LCD显示酒精浓度值，从而告知驾驶人在合理安全的情况下才能驾车行驶。经过大量实验，基于单片的酒精浓度测试仪比传统的机械检测仪或酒精计灵敏，扩展简单，准确方便，可靠性好，检测精度高，控制功能强大，对超出阀值进行声光报警，直观准确。所以基于单片机的酒精浓度监测仪的研究对社会公共安全的提高具有很大促进作用。关键词：酒精浓度传感器，单片机，数模转换，硬件设计，报警IABSTRACTABSTRACTInrecentyears,alongwithourcountryeconomydevelopment,moreandmoreprivatecarshavecomeintothevision.Whiledrunkdrivingtrafficaccidentscausedbytherepeated.Thispaperusedforpublicinspectionandoverrunwiththefunctionsofalcoholconcentrationintelligenttester.Designschemebasedon89C51andMQ3alcoholconcentrationsensor,thesystemwillbethefirstsensoroutputsignalthroughtheA/Dconvertercircuitaftertreatment,thentheMCUdataprocessing,andfinallybyLCDdisplayalcoholleel.Thustoldpeopleinthesafetyofreasonabledrivingcandrive.Refinedoveralargenumberofexperiments,usingthealcoholconcentrationtestinstrumentthantraditionalmechanicaldetectororalcoholgauge,extendedsimple,accurateandconvenient,goodreliability,highprecision,strongcontrolfunction,togobeyondthresholdalarm,intuitiveandaccurate.SobasedonSCMalcoholconcentrationmonitorresearchforsocialpublicsecurityincreaseofgreatvalue.Keywords:Alcohol,concentrationsensor,microcontrolleranalog-to-digitalconversion,hardwaredesign,alarmII目录目录1引言-----------------------------------------------------------------------11.1酒精浓度检测仪的背景----------------------------------------------------11.2酒精浓度检测仪现状及发展趋势--------------------------------------------11.3本课题实现目标----------------------------------------------------------12设计方案和元器件选择---------------------------------------------------------22.1设计方案----------------------------------------------------------------22.2单片机的选择------------------------------------------------------------22.3传感器------------------------------------------------------------------42.4数模转换器--------------------------------------------------------------52.5AT24C02存储器-----------------------------------------------------------62.6LCD显示模块-------------------------------------------------------------63系统硬件设计----------------------------------------------------------------83.1硬件设计原理------------------------------------------------------------83.2硬件设计外围电路--------------------------------------------------------93.2.1晶振电路、复位电路设计----------------------------------------------93.2.2报警电路设计-------------------------------------------------------113.2.3电源电路设计-------------------------------------------------------113.2.4信号调制电路设计---------------------------------------------------123.2.5A/D转换电路设计----------------------------------------------------133.2.6外围扩充存储器电路设计---------------------------------------------144系统软件设计----------------------------...
