摘要洛阳理工学院毕业设计（论文）PAGEIV毕业设计论文基于STC89C52单片机出租车计价器设计摘要随着城市建设日益加快，象征着城市面貌的出租车行业也将加速发展。现在各大中城市出租车行业都已普及自动计价器，所以计价器技术的发展有很好的前景。尽管小城市尚未普及，但计价器的普及也是毫无疑问的，所以未来汽车计价器的市场还是十分有潜力的。出租车计价器是单片机的一种典型应用。基于单片机的计价器是由单片机和外部电路组成。包括检测模块，控制模块，人机模块。里程检测模块由A44E构成，控制模块包括STC89C52单片机和AT24C02，人机模块包括独立键盘和LED动态显示。系统性能指标1.设定价格；2.显示当前单价、行驶里程和总金额；3.里程精确到0.1公里。通过多次调试系统性能达到设计要求。关键词：STC89C52，霍尔传感器A44E，I2C总线，动态显示DesignofTaximeterBasedonSTC89C52ABSTRACTWiththerapiddevelopmentofcityconstriction,thetaxiindustrywhichsymbolizesthecityscapealsohasanacceleratedprogress.Nowadaystheautomatictaximeterhasbeenwidelyusedintaxiindustryinmanycites.Therefore,thedevelopmentofautomatictaximeterisdoomed.Althoughautomatictaximeterisnotspreadinsometowns,thereisnodoubtthatitwouldbepopularized.Thus,infuturethebusinessofautomatictaximeterisstillpotential.Onetypicalapplicationofsinglechipcomputerisautomatictaximeter.ThehardwareofthisdesigniscomposedofsinglechipcomputerandperipheralcircuitswhichconsistofDetectionUnit,ProcessingUnitandHumanComputerInteractionUnit.TheDetectionUnitisbasedonHall-effectsensor.TheProcessingUnitcontainsSTC89C52andAT24C02.HumanComputerInteractionUnitiscomposedofkeyboardandLED.Thefunctionofthissystemincludesasfollows:Settheunitprice;Displaytheunitprice,totalamountandmileage.Accuracy:0.1km.Afterrepeatedlydebugging,theperformanceofthissystemisreachedthedesignrequirements.KEYWORDS:STC89C52,Hall-effectsensor,A44E,I2CBus,Dynamicdisplay前言目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc295830921"前言PAGEREF_Toc295830921\h1HYPERLINK\l"_Toc295830922"第1章系统工作原理PAGEREF_Toc295830922\h3HYPERLINK\l"_Toc295830923"1.1功能要求PAGEREF_Toc295830923\h3HYPERLINK\l"_Toc295830924"1.2基本原理PAGEREF_Toc295830924\h3HYPERLINK\l"_Toc295830925"第2章硬件设计PAGEREF_Toc295830925\h5HYPERLINK\l"_Toc295830926"2.1单片机最小系统单元PAGEREF_Toc295830926\h5HYPERLINK\l"_Toc295830927"2.2霍尔传感器单元PAGEREF_Toc295830927\h6HYPERLINK\l"_Toc295830928"2.3掉电存储单元PAGEREF_Toc295830928\h8H