基于单片机防酒后驾驶控制系统设计TheDesignOfAnti-drunkDrivingControlSystemOnSingleChipMicrocomputer2013年6月摘要近年来，随着我国汽车的普及，汽车的安全问题已经引起了我们的注意，根据最新的数据显示，目前，酒后驾车成为车祸频发的主要原因，我国因酒后驾车而导致的死亡人数平均每年以7.3%的速度增长，酒后驾车轻则害人害己，重则车毁人亡。为了防止酒后驾车，设计一种智能电路来检测驾驶员体内的酒精含量并且能够及时切断汽车电源是非常有必要的。该设计由MQ-3酒精传感器来测量饮酒后驾驶员体内的酒精浓度，通过A/D0832转换器转换成数字信号传入单片机，最后由单片机通过对数字信号的处理来显示酒精浓度。在超过阈值时，发出声光报警，并且通过控制继电器来切断汽车电源。软件方面各个子程序的功能相对独立，便于调试和修改。当驾驶员体内酒精浓度超标时，该系统能够自动切断汽车启动系统电源，同时发出声光报警，并通过数码管实时显示酒精浓度。本系统选择AT89C51单片机、A/D0832转换器、MQ-3酒精传感器、数码管、LED、蜂鸣器、继电器等元器件通过DXP来设计硬件系统电路图，使用keiluvision4完成软件系统的编程调试。关键词：AT89C51单片机；A/D0832转换器；MQ-3酒精传感器；智能电路；酒后驾车；IABSTRACTInrecentyears,withthepopularityofcarsinChina,safetyproblemofcarshascausedourattention.Accordingtothelatestdata,drivingafterdrinkinghasbecomethemainreasonofthecaraccident,thedeaththatcasedbythecaraccidenthasbeenincreasedattherateof7.3%.Drivingafterdrinkingissodangerousthatitcausedeathorhurt.Toavoidthedrivingafterdrinking,itisnecessarytodesignaintelligentcircuittocheckthealcoholconcentrationandcutoffthepowerofthecarintime.ThedesignusestheMQ-3alcoholsensortomeasurethealcoholconcentrationofthedriver'sbodyandsendthosesignalstoSCMbyA/D0832converter.Inthelast,theSCMprocessthedigitalsignaltodisplayalcoholconcentration.Whenthealcoholconcentrationbeyondthemarkofstandardalcoholconcentration,thesystemissuesasoundlightalarmandcutsoffthepowerofthecar.Insoftwareaspect,everyprogramisindependent,soitiseasywhendebugingtheprogram.Whenthedriver'salcoholconcentrationexceedsthesafetystandardofthesystem,thedesigncanautomaticallycutoffthepowerofthecartostopitsengineandsendoutalarm.Atthemeantimeadigitaltubereal-timedisplaythealcoholconcentration.Inthissystem,thispaperchoosesAT89C51SCM,A/D0832converter,MQ-3Alcoholsensor,Nixietube,LED,buzzerandrelayasitmainparts,andthroughtheDXPdesignthehardwarepart,usetheKeilUvision4tocompletethesoftwarepart.KeyWords：AT89C51SCM;A/D0832converter;MQ-3alcoholsensor;Intelligentcircuit;drunkdrivingII目录1绪论..........................................................................................................................11.1课题研究的目的...........................................................................................11.2课题研究的意义...........................................................................................12系统整体设计..........................................................................................................32.1系统整体设计思路.......................................................................................32.2系统方案设计...............................................................................................32.2.1酒精传感器的选择............................................................................42.2.2单片机的选择....................................................................................52.2.3A/D转换器的选择.............................................................
