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题毕题目毕业基于单姓学所在专业指导日业设单片机名号在学院业班级导教师期设计机的环0707信2011计（境温湿潘新071112111理学院信科（1）谭保华11年6月论湿度检114）班华月12日文）检测系统统湖北工业大学理学院2011届毕业设计论文I摘要环境温湿度检测系统是日常生活、工业生产和农业管理中广泛使用的一种设备。该设备具备以下主要功能：实时测出环境中的温度和湿度参数值，并显示出来，根据设定的报警限予以报警指示，可以和上层控制器通信。随着单片机的大规模应用，单片机在检测系统中也越来越多的被使用。本设计以AT89S52这款低功耗、高性能、在系统编程的8位单片机为系统控制处理核心，由单总线数字温湿度传感器DHT11、数码管显示屏、LED与蜂鸣器、通信串口和按键控制输入等五个部分组成，从而实现环境温湿度检测系统的主要功能。后期的探索设计——换用红外遥控控制和LCM为显示屏、外加时钟和存储芯片、增加照度检测电路，极大地提升了系统的性能，使系统不仅可以检测并显示环境温度、湿度和照度变量，而且可以按照时间顺序存储适量的数据。此外，系统有降压整流和稳压滤波电路，可用交流市电（220V）、各种安全直流电（5～24V）、太阳能电池等为系统供电，并且可以存储少量电能（900mAh），因此，系统有较宽的工作电压，可满足多种应用场合。本设计由Protel画出了电路原理图和PCB图，并由此完成了硬件的制作，使用C51语言对单片机进行编程控制，并模块化仿真，昀后通过综合调试，符合预期的设计要求。关键词：AT89S52单片机，DHT11传感器，串口通信，温湿度检测，PCB设计湖北工业大学理学院2011届毕业设计论文IIAbstractEnvironmenttemperatureandhumiditydetectionsystemisakindofequipmentwhichiswidelyusedindailylife,industrialproductionandagriculturalmenagement.Theequipmenthasfollowingmainfunction:detectingthetemperatureandhumidityparametersintheenvironmentreal-timeanddisplaythem,givingalarmindicationaccordingtothesetlimits,andbeingabletocontactwithuppercontroller.WiththeSCMusedlarge-scalely,theSCMismoreandmoreusedindetectionsystem.Thisdesign,usesthe8-bitSCMnamedAT89S52,whichhasalotofadvantagessuchaslow-powerdissipation,high-performanceandISP,andmadeupoffiveparts:single-wiredigitaltemperatureandhumiditysensor,digitrondisplay,LEDandbuzzer,serialcomunicationsandkeysinput,thusperformthefunctionofenvironmenttemperatureandhumiditydetectionsystem.Theexplorationdesigninlaterstage,includinginfraredremotecontrolandLCMdisplay,clockandmemorychips,andilluminationdetectioncircuit,immenselypromotesthepropertyofthesystem,makesitnotonlydetecteanddisplaythetemerature,humidityandillumination,butalsostoresomedatainorderoftime.Inaddition,withstep-downrectifierandstabilivoltfiltercircuit,thesystemcanuseutilitypowerAC220V,differentsafetyDC5~24V,solarbatterytosupplypower,andstoresomeelectricenergyabout900mAh,sothatithasawidepowersupplyvoltageandmeetsdifferentapplicationplaces.ThedesigngivesthecircuitdesignschematicsandPCBdiagramwithProtel,andcompletesthehardwarepartoftheproduction,andusesC51languagesystemtoaccomplishthecontrolprogramofSCM,andsimulateseverypartsuccessfully.Throughthesyntheticaldebugging,thedesignachievestherequireddesigns.Keywords:AT89S52SCM,DHT11sensor,serialcommunication,temperatureandhumiditydetection,PCBdesign湖北工业大学理学院2011届毕业设计论文III目录摘要..................................................................................................................................................IAbstract............................................................................................................................................II第一章绪论.....................................................................................................................................11.1设计的目的意义调查.......................................................................................................11.2设计的市场现状分析.......................................................................................................21.3设计的内容要求说明.......................................................................................................21.4设计的实施方案构想.......................................................................................................3第二章硬件的设计.........................................................................................................................52.1单片机的选用...................................................................................................................52.2传感器的选用...................................................................................................................62.3数码管驱动电路设计.......................................................................................................82.4报警电路设计.................................................................................................................102.5控制输入电路设计.........................................................................................................112.6串口通信电路设计.........................................................................................................122.7稳压电源电路设计.........................................................................................................132.8系统三大部分的PCB设计.............................................................................................13第三章程序的设计.......................................................................................................................173.1程序功能描述、单片机内部资源分配和程序流程图.................................................173.2编程语言和工具的选择以及程序文件的分配.............................................................183.3传感器通信程序设计.....................................................................................................193.4数码管扫描程序设计.....................................................................................................233.5报警及设置程序设计.....................................................................................................243.6按键扫描程序设计............