大棚温湿度控制系统设计

河南城建学院本科毕业设计（论文）摘要I摘要随着大棚技术的普及，温室大棚数量不断增多，对于蔬菜大棚来说，最重要的一个管理因素是温湿度控制。温湿度太低，蔬菜就会被冻死或者停止生长，所以要将温湿度始终控制在适合蔬菜生长的范围内。传统的温度控制是在温室大棚内部悬挂温度计，工人依据读取的温度值来调节大棚内的温度。传统的温度控制措施显现出很大的局限性,为此，在现代化的蔬菜大棚管理中通常有温湿度自动控制系统，以控制蔬菜大棚温度，适应生产需要。该论文主要阐述了基于STC89C52单片机的大棚温湿度控制系统设计原理，主要电路设计及软件设计等。同时设计了能给系统提供稳定工作电压的电源电路。该系统采用STC89C52单片机作为控制器，DHT11作为温湿度数据采集系统，可对执行机构发出指令实现大棚温湿度参数调节，具有温湿度实时显示和控制等功能。关键词：STC89C52，DHT11，蔬菜大棚，温湿度，传感器河南城建学院本科毕业设计（论文）AbstractIIAbstractWiththepopularizationoftrellistechnology,greenhousetrellisanever-growingnumber,forvegetableshedspeaking,oneofthemostimportantmanagementfactoristhetemperatureandhumiditycontrol.Temperatureistoolow,thevegetableswillfreezetodeathorstopgrowing,sowillalwayscontroltemperatureandhumidityinasuitablevegetablegrowthrange.Traditionaltemperaturecontrolisingreenhousetrellisinternalhangingathermometer,workersaccordingtoregulatethetemperaturereadingthetemperatureinsidetheshelter.Traditionaltemperaturecontrolmeasureswillshowgreatbureausex.Therefore,inmodernvegetableshedmanagementzhongtongoftentemperatureandhumidityautomaticcontrolsystem,inordertocontrolthetemperature,adapttothetrellisvegetableproductionneeds.ThisthesismainlyelaboratedbasedonSTC89C52canopytemperatureandhumiditycontrolsystemdesignprinciple,maincircuitdesignandsoftwaredesign,etc.Usingthetransformers,changeACtoDCbecomenecessarily.ThissystemUSESSTC89C52singlechipmicrocomputerascontroller,DHT11astemperatureandhumiditydataacquisitionsystem,maytotheactuatordirectivesrealizetrellistemperatureandhumidityparametersadjustment,temperatureandhumidityreal-timedisplayandcontrol,andotherfunctions.Keywords：STC89C52;DHT11;vegetableshed;Temperatureandhumidity;sensor河南城建学院本科毕业设计（论文）目录III目录摘要....................................................................................................................................................IAbstract................................................................................................................................................II目录....................................................................................................................................................III1绪论................................................................................................................................................11.1选题意义...............................................................................................................................11.2国内外发展趋势....................................................................................................................11.3系统的主要性能指标............................................................................................................21.4主要工作任务........................................................................................................................21.5本章小结...............................................................................................................................22系统方案选择和工作原理...............................................................................................................32.1系统综述...............................................................................................................................32.2系统设计方案选择................................................................................................................32.3系统工作原理........................................................................................................................42.4本章小结...............................................................................................................................53系统硬件设计..................................................................................................................................63.1STC89C52构成的最小系统..................................................................................................63.1.1STC89C52单片机简介...............................................................................................63.1.2晶振回路...................................................................................................................103.1.3复位电路...................................................................................................................103.2温湿度传感器的选择..........................................................................................................123.2.1温湿测量相关概念...................................................................................................123.2.2温湿度传感器的发展................................................................................................133.2.3DHT11的工作原理...................................................................................................153.3温湿度测量回路的设计......................................................................................................193.4显示电路设计......................................................................................................................193.5报警电路设计...........................................................................................