2012届毕业设计说明书计程车里程表系统设计院、部：电气与信息工程学院学生姓名：宋贵指导教师：陈坚职称：讲师专业：电子信息工程班级：电子0802学号：084011402462012年5月摘要智能仪器仪表技术是一门集电子技术、单片机技术、自动化仪表、自动控制技术、计算机应用等一体的跨学科的专业技术。自20世纪90年代初以来，这项技术已逐步引入到国内工科专业中，如电子信息、通讯、自动化、计算机应用等信息类专业。随着经济的发展，汽车运输行业也快速发展起来，计程车也成为城市生活中的重要交通工具。乘车时，乘客与司机之间的交易是通过按里程计价的，里程表的好坏直接关系到双方的利益，所以设计一个功能合适、性能良好的简易计程车里程表系统具有实际的应用意义。本系统采用ATMEL公司的AT89S52单片机为核心，使用12MHz晶振提供时钟信号,利用霍尔传感器检测车速，通过软件编程的方法实现记时、里程检测、费用计算，同时通过LED数码管将里程数、总费用直观显示出来，从而达到计费的目的。该系统设有五个按键（清除、查询/确认、停止、单程/往返、功能选择）,进行相应的操作就可实现单程/往返模式选择、停止计费、等待时间查询、清除复位等功能。具有结构简单操作方便、显示直观、运行稳定等优点，有较高的推广应用价值。关键词：计程车里程表；AT89S52；霍尔传感器；硬件设计；软件设计IABSTRACTIntelligentinstrumenttechnologyisacollectionofelectronictechnologyandsingle-chipmicrocomputertechnology,automationinstrument,automaticcontroltechnology,computerapplication,oneoftheprofessionaltechnicalsubjects.Sincetheearly1990s,thetechnologyhasintroducedgraduallytodomesticengineeringprofessionals,suchaselectronicinformationandcommunications,automation,computerapplications,andotherinformationspecialty.Withthedevelopmentofeconomy,thecartransportindustryalsodevelopedrapidly,thetaxialsobecometheimportanttraffictoolscitylife.Gobycar,passengers,andthedriveroftransactionsbetweenthebypressingthemileageofvaluationis,theodometerisdirectlyrelatedtotheinterestsofbothparties,sothedesignofafunction,thegoodperformanceofsuitablesimpletaxi"milestones"systemhastheactualapplications.ThesystemUSEStheATMELcompanyAT89S52SCMasthecore,theuseof12MHzcrystalsprovidestheclocksignal,usinghallsensortestspeed,andthroughprogrammingmethod,time,costcalculationmileagedetection,andatthesametimethroughLEDdigitaltubewillmileage,totalcostvisualdisplayout,soastoachievethepurposeofpricing.Thesystemhasfivebuttons(clear,inquiresconfirmation,stop,one-way/shuttle,functionchoose),carriesonthecorrespondingoperationcanachieveaone-way/shuttlemodeselection,stopbilling,waitingtimeinquiresclearreduction,etc.Function.Thestructureissimple,theoperationisconvenient,directdisplay,stableoperation,etc,haveahighapplicationvalue.Keywords：taxi"milestones"；AT89S52；hallelement；hardwaredesign；softwaredesignII目录1概述.................................................................................................................................11.1计程车里程表概述.............................................................................................11.2单片机概述.........................................................................................................12设计任务、功能要求.....................................................................................................32.1设计任务.............................................................................................................32.2功能要求.............................................................................................................32.2.1基本...
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