基于51单片机智能温度计的设计

##大学本科毕业生学士学位论文1目录目录......................................................................................................................................................1摘要..................................................................................................................................................................2Abstract...........................................................................................................................................................3引言..................................................................................................................................................................4数字式温度计的发展历程..............................................................................................................4课题研究的目的和意义..................................................................................................................4第1章系统设计........................................................................................................................................6第2章硬件电路的设计..............................................................................................................................72.1主控制器的选择及原理图................................................................................................................72.1.1AT89S51的引脚图：..........................................................................................................72.1.2上电/手动复位电路：..........................................................................................................112.2测温电路的设计.............................................................................................................................122.2.1AD590温度传感器的原理及应用......................................................................................122.2.2基准电压TL431...................................................................................................................132.3AD转换器的选择与工作原理....................................................................................................142.3.1AD转换器的选择.............................................................................................................142.3.2TLC549的工作原理.............................................................................................................152.4显示电路的设计..............................................................................................................................162.5按钮和报警电路的设计..................................................................................................................182.6直流电源的设计..............................................................................................................................19第3章程序设计..........................................................................................................................................20参考文献........................................................................................................................................................24附录：1总电路图.........................................................................................................................................25附录2：C语言源程序.................................................................................................................................26##大学本科毕业生学士学位论文2摘要温度是工业生产和自动控制中最常见的工艺参数之一。过去温度检测系统设计中,大多采用模拟技术进行设计,这样就不可避免地遇到诸如传感器外围电路复杂及抗干扰能力差等问题;而其中任何一环节处理不当,就会造成整个系统性能的下降。随着半导体技术的高速发展,特别是大规模集成电路设计技术的发展,数字化、微型化、集成化成为了传感器发展的主要方向。本文介绍了单片机AT89S51的特性、内部结构及工作原理，给出了数模转换器TCL549与单片机AT89S1接口的应用实例，以及由两者组成温度检测系统的方法，并给出了TCL549进行各种操作的软件流程图及操作程序。关键词：温度检测；AD590;AD转换器TCL549；单片机AT89S51##大学本科毕业生学士学位论文3AbstractTemperatureisthemostcommononeofprocessparametersinautomaticcontrolandindustrialproduction.Inthetraditionaltemperaturemeasurementsystemdesign,oftenusingsimulationtechnologytodesign,andthiswillinevitablyencountererrorcompensation,suchaslead,complexoutsidecircuit,pooranti-jammingandotherissues,andpartofadealwiththemImproperly,couldcausetheentiresystemofthedecline.Withmodernscienceandtechnologyofsemiconductordevelopment,especiallylarge-scaleintegratedcircuitdesigntechnologies,digital,miniaturization,integrationsensorsarebecominganimportantdirectionofdevelopment.Thispaperpresentsthebasicconceptofdetection,asingledigitaltemperaturesensorTCL549thecharacteristicsandworkingprincipleisgivenTCL549with89S51MCUinterfaceapplicationexamples,andthecompositionofTCL549temperaturedetectionsystem,andgivesthevariousoperationsoftheTCL549Softwareflowchartandoperationprograms.Keywords:TemperatureDetection；AD590；TCL549;AT89C2051；Clanguage##大学本科毕业生学士学位论文4引言数字式温度计的发展历程十七世纪是温度计诞生和发展的最初阶段,这个物理仪器几乎比任何其它仪器都得到更广泛的应用。现代的历史研究认为最早发明温度计的科学家是伽利略，他于1592年发明了最早的气体温度计，最早的液体温度计是荷兰科学家华伦海特制造出来。随着宇航、核能、冶金、材料、低温、微电子学和生物医学等方面的发展，对温度测量、控制的精度和范围提出了越来越高的要求，尤其是对温度的测量非但要准确，而且需读取数值更直观更方便，从而促进了温度测量和控制技术的迅速发展。虽然水银温度计至今仍是各种温度测量的计量标准。可是它的缺点是刻度间隔通常都很密,不容易准确分辨,读数因难,而且它们的热容量还比较大,达到热平衡所需的时间较长,因此很难读准并且使用非常不方便，而且水银有毒，玻璃管易碎。后来出现代替水银的有酒精温度计和金属簧片温度计，它们虽然没有毒性，但测量精度很低。后来接着出现了热电阻温度计、热电偶