基于单片机的DS18B20多点测温系统LCD1602显示

毕业论文（设计）中文题目:基于单片机的DS18B20温度传感器测温系统设计英文题目:ADesignoftheDS18B20TemperatureTestSystemBasedonMCU姓名******学号080705135专业班级**************指导教师*************提交日期2012年5月20日教务处制惠州学院HUIZHOUUNIVERSITYI基于单片机的DS18B20温度传感器测温系统设计姓名：**班级：***指导老师：***职称：**(惠州学院电子科学系，广东，惠州，516007)摘要随着社会的进步和工业技术的发展，人们越来越重视温度因素，许多产品对温度范围要求严格，而目前市场上普遍存在的温度检测仪器大都是单点测量，同时有温度传递不及时、精度不够的缺点，不利于工业控制者根据温度变化及时作出决定。在这样的形式下，开发一种能够同时测量多点，并且实时性高、精度高，能够综合处理多点温度信息的测量系统就很有必要。本课题以AT89C52单片机系统为核心，能对多点温度进行实时巡检。DS18B20是一种可组网的高精度数字式温度传感器，由于其具有单总线的独特优点，可以使用户轻松的组建起传感器网络，并可使多点温度测量电路变得简单、可靠。本文结合实际使用经验，介绍了DS18B20数字温度传感器在单片机下的硬件连接及软件编程，并给出了软件流程图。关键词：DS18B20多点测温单片机LCD1602IIAbstractAstheindustryandthesocietydeveloping,thetemperaturebecomesmoreandmoreimportantandalotofproductsaresensitivetotemperature.However,temperaturemeasuringapparatusinthemarketnowonlycancheckandmeasurethetemperatureofonepoint,atthesametime,thetemperatureinformationisnotrealtimeandtheprecisionislow.Ittakesagreatoftroublesfortheindustry-controllerstomakedecision.Inthissituation,designandimplementoneapplicablesystemwhichcanwatchmeasureandcontrolthetemperatureandthemeasuringresultsisrealtimeandtheprecisionisgreatismoreessential.Inordertomeetingthisapplication,thispapertalkaboutTheMultiple-Point’stemperatureMeasuringSystem.Thissystembasedonsinglechipcomputer,caninspectandcontrolmultipletemperaturesinrealtime.Asakindofhigh-accuracydigitalnettemperaturesensor，DS18B20canbeusedbuildingasensorneteasily.Itcanalsomakethenetsimpleandreliablewithit'sspecial1-wireinterface.ThispaperintroducestheapplicationofDS18B20withsinglechipprocessor.Keywords：DS18B20Multi-pointtemperatureMCULCD1602目录摘要................................................................................................................................IAbstract.........................................................................................................................II第一章绪论.................................................................................................................11.1课题背景.........................................................................................................11.2本课题研究意义.............................................................................................21.3本课题的任务.................................................................................................21.4系统整体目标.................................................................................................3第二章方案论证比较与选择......................................................................................32.1引言.................................................................................................................32.2方案设计.........................................................................................................32.3方案的比较与选择.........................................................................................4第三章硬件设计..........................................................................................................43.1STC89C52单片机简介....................................................................................43.2DS18B20介绍..................................................................................................83.3系统电路设计...............................................................................................163.4显示电路设计...............................................................................................173.5按键电路设计...............................................................................................173.6三点测温电路...............................................................................................18第四章软件设计........................................................................................................184.1软件开发工具的选择.................................................................................184.2系统软件设计的一般原则............................................................................194.3系统软件设计的一般步骤...........................................................................204.4三路测温软件实现.......................................................................................20第五章误差分析........................................................................................................255.1误差产生.......................................................................................................255.2降低误差方法...............................................................................................255.3挂接DS18B20个数论证...............................................................................26第六章调试与小结....................................................................................................26致谢..............................................................................................................................28参考文献......................................................................................................................29附录.........................................................................................................................