河南理工大学毕业设计（论文）说明书摘要环境温度对工业、农业、商业和人们的日常生活都有很大的影响，而温度的测量也就成为人们生产生活中一项必不可少的工作。随着单片机技术的不断发展单片机在日用电子产品中的应用越来越广泛，温度传感器DS18B20具有线性优良、性能稳定、灵敏度高、抗干扰能力强、使用方便等优点，广泛应用于冰箱、空调器、粮仓等日常生活中温度的测量和控制。本设计所介绍的数字温度计使用单片机AT89s52单片机，测温传感器使用DS18B20，用4位共阴极LED数码管以动态方式实现温度显示,分时轮流通电，从而大大简化了硬件线路，同时，采用串口通信方式可大大简化硬件电路和软件程序的设计，节省了I/O口。DS18B20数字温度传感器是单总线器件与51单片机组成的测温系统，具有线路简单、体积小等特点，而且在一根通信线上，可以挂接多个DS18B20，因此可以构成多点温度测控系统。关键词：单片机；多点检测；串口通信AbstractEnvironmentaltemperaturetoindustry,agriculture,commerce,andpeople'sdailylifeI河南理工大学毕业设计（论文）说明书hasalotofinfluence,andthemeasurementofthetemperaturewillbecomeanindispensablepeopleproductionandlifeofthework.Alongwiththedevelopmentofthesinglechipmicrocomputertechnology,microcomputerinthedailyelectronicproductsismoreandmoreextensiveapplication,thetemperaturesensorDS18B20havegoodlinear,stableperformance,highsensitivity,anti-interferenceabilitystrong,easytouse,widelyusedintherefrigerator,airconditioner,granaries,etcindailylifetemperaturemeasurementandcontrol.Thedesignofthedigitalthermometerintroducedusesinglechipcomputer89s52microcontroller,temperaturesensorDS18B20use,withatotalof4cathodetubeLEDdigitaldisplaytorealizedynamicwaytemperature,inturntime-sharingelectricity,whichgreatlysimplifiedthehardwarecircuit,andatthesametime,theserialinterfacecommunicationmodecangreatlysimplifiedthehardwarecircuitandsoftwareprogramdesign,savetheI/Oport.DigitaltemperaturesensorDS18B20isthesinglebusdevicesand51SCMcomposition,temperaturemeasurementsystem,withsimpleline,littlevolumefeatures,butatacommunicationsline,canbearticulatedmultipleDS18B20,socanformmulti-pointtemperaturemeasurementandcontrolsystem.KeyWords:SingleChipMicrocomputer;Multi-pointdetection;Serialcommun--ication目录1绪论.............................................................................................................................11.1前言.......................................................................................................................11.2研究背景...............................................................................................................11.3研究意义...............................................................................................................11.4国内外研究现状...................................................................................................21.5研究内容...............................................................................................................22系统方案论证.............................................................................................................32.1传感器部分方案论证...........................................................................................3II河南理工大学毕业设计（论文）说明书2.2控制部分方案论证...............................................................................................42.3系统整体方案.......................................................................................................43硬件电路设...
