基于DHT11的温湿度控制系统设计

1本科毕业设计(论文)题目：基于DHT11的温湿度检测系统设计基于DHT11的温湿度检测系统设计摘要DHT11数字温湿度传感器是一款含有已校准数字信号输出的温湿度复合传感器,传感器包括一个电阻式感湿元件和一个NTC测温元件，具有品质卓越、超快响应、抗干扰能力强、性价比极高等特点。温湿度是我们日常生活中最基本的环境参数，温湿度的检测具有重要意义。本文主要介绍该传感器的特点，并采用STC89C52单片机，LCD1602液晶显示器，及一些元器件进行组合，从而完成对温湿度的检测。选用温湿度传感器DHT11检测环境温度和湿度，将其输出的数字信号输入单片机STC89C52，单片机采集数字信号并进行数据处理，然后由LCD1602进行显示，外加复位电路、时钟电路、键盘电路和报警电路。本系统整体设计具有界面友好、控制灵活、硬件系统集成度高、电路简单、II功能强、性能可靠、成本低等特点。对我们的生活特别有帮助。关键词:DHT11；单片机；温湿度；检测。IIIDesignaSystemofTemperatureandHumidityDetectionBasedontheDHT11AbstractDHT11temperatureandhumiditydigitalsensorisacompositetemperatureandhumiditysensor,itoutputsthealreadycalibrateddigitalsignal,thesensorincludesaresistancetypemoistureelementandaNTCtemperaturemeasuringelement,withexcellentquality,superfastresponse,stronganti-interferenceability,extremelyhighperformance-priceratio.Temperatureandhumidityisthemostbasicparametersofenvironment,temperatureandhumiditydetectionisofgreatsignificance.Thispapermainlyintroducesthecharacteristicsofthesensors,andusestheSTC89C52singlechip,LCD1602display,andsomeofthecomponentsarecombined,soastocompletethedetectionoftemperatureandhumidity.ChooseDHT11temperatureandhumiditysensorstodetecttemperatureandhumidity,theoutputofdigitalsignalinputmicrocontrollerSTC89C52single-chipdigitalsignalanddataprocessing,andthenbytheLCD1602display,plustheresetcircuit,clockcircuit,keyboardcircuitandalarmcircuit.Thesystemdesignwithfriendlyinterface,flexiblecontrol,highhardwaresystemintegration,simplecircuit,functional,reliableperformance,lowcost,etc.Particularlyhelpfultoourlife.Keywords:DHT11;microcontroller;temperatureandhumidity;detection.IV目录中文摘要................................................1Abstract................................................21绪论..................................................11.1研究的意义..................................................11.2国内外发展现状..............................................11.3设计的市场现状分析..........................................21.4温湿度检测技术和存在的问题..................................21.5设计内容和预期结果..........................................31.5.1主要完成内容...........................................31.5.2本文的设计思路.........................................31.5.3预期结果...............................................42温湿度测量系统方案设计.................................52.1系统总体设计.................................................52.2系统设计原则................................................52.3系统方案的论证与选择........................................62.3.1单片机的选择...........................................62.3.2显示器的选择...........................................72.3.3报警系统的选择.........................................83系统硬件设计..........................................93.1主控模块.....................................................93.1.1STC89C52的简介........................................93.1.2STC89C52的主要特点....................................93.1.3STC89C52的引脚功能....................................93.1.4STC89C52的控制接口...................................11V3.2复位电路...................................................113.3时钟电路...................................................123.4显示模块...................................................133.4.1LCD1602简介..........................................133.4.2LCD1602特性..........................................133.4.3LCD1602管脚功能......................................133.4.4LCD1602字符集........................................143.4.5LCD1602与单片机的接口................................143.5温湿度采集模块..............................................153.5.1温湿度传感器简介......................................153.5.2串行接口（单线双向）..................................163.5.3引脚与接口............................................183.6键盘模块...................................................183.7报警模块...................................................193.7.1蜂鸣器报警原理........................................193.7.2报警电路接口..........................................203.8串口通信模块...............................................203.8.1RS-232C简介..........................................203.8.2MAX232简介...........................................213.9小结........................................................224系统软件设计.........................................244.1主程序模块程序设计.........................................244.21602液晶显示模块程序设计...................................254.3传感器模块程序设计.........................................264.4键盘模块设计...............................................27VI4.5小结.......................................................285设计中遇到的问题及解决方法............................295.1硬件问题及解决方法.........................................295.2软件所遇问题及解决方法.....................................296结论.................................................30参考文献...............................................31致谢..................................错误!未定义书签。毕业设计（论文）知识产权声明............................33毕业设计（论文）独创性声明..............................35附录...................................................36附录1硬件原理图...............................................36附录2程序....................................................3771绪论11绪论1.1研究的意义温度和湿度是两个基本的环境参数。在我们