基于单片机的大棚温湿度监测系统的设计-本科毕业论文(设计)

南昌工程学院毕业设计(论文)信息工程学院系（院）通信工程专业毕业设计（论文）题目大棚温湿度监测系统的设计学生姓名张小宁班级11级通信工程学号2011103429指导教师聂菊根完成日期2015年04月28日大棚温湿度监测系统的设计Thedesignoftemperatureandhumiditymonitoringsystemingreenhouse总计毕业设计（论文）34页表格12个插图27幅I摘要在大棚种植术里，温湿度是影响作物产量的关键因素，传统的温湿度测量采集方式具有精度不高，操作费时费力的问题，不能够动态监测，很容易造成由于环境因素突变而造成的减产甚至无产的惨痛损失。本设计以AT89S52单片机为控制核心，用SHT11数字式温湿度传感器作为数据采集，并把数据显示在LCD显示屏上，能任意时刻观测到大棚内部的实时环境参量；用户可自己设定温湿度上下限，当系统检测到的温湿度在安全阀值之外立即通过报警电路报警。这样设计出来的系统具有实时性、精度高、稳定性、低能耗、低成本、操作简单等诸多优点，可广泛应用与大棚种植的环境之中。关键词：AT89S52；SHT11；大棚；温湿度；传感器IIAbstractIngreenhousecultivationtechnique,thetemperatureandhumidityarethekeyfactortoaffecttheyieldofcrops.Measurementoftemperatureandhumidityacquisitionarethetraditionalwaywhichisnotaccurateenough.Itconcludetime-consumingproblem,cannotdynamicmonitoring,andveryeasytocauseapainfullossevennogainduetosharplyenvironmentchange.ThedesignuseAT89S52microcontrollerasthecontrolcore,andSHT11digitaltemperatureandhumiditysensorisusedfordataacquisition,thedataaredisplayedontheLCDscreen,real-timeenvironmentalparameterswithinthegreenhousecanbeobservedatanytime.Theusercansettheupperandlowerlimitsoftemperatureandhumidity,Whenthetemperatureandhumidityarenotinthesaferange,thesystemwillalarmviaalarmcircurt.Thiskindofsystemdesignwithreal-time,highprecision,stability,lowenergyconsumption,lowcost,simpleoperationandmanyotheradvantages,canbewidelyusedingreenhousecultivationenvironment.Keywords:AT89S52;SHT11;temperatureandhumidity;monitoring;alarmIV目录摘要.........................................................................................................................................IAbstract................................................................................................................................II第一章绪论..........................................................................................................................11.1选题背景....................................................................................................................11.2国内外研究现状........................................................................................................11.3系统主要设计内容....................................................................................................21.3.1系统框图.........................................................................................................21.3.2元器件的选择.................................................................................................2第二章系统硬件设计.......................................................................................................52.1系统性能概述............................................................................................................52.2单片机模块...............................................................................................................52.2.1AT89S52主要功能概述................................................................................52.2.2AT89S52封装结构........................................................................................52.2.3AT89S52引脚功能.........................................................................................62.3单片机最小系统.......................................................................................................72.3.1单片机............................................................................................................72.3.2晶振电路........................................................................................................72.3.4复位电路.........................................................................................................82.4传感器模块...............................................................................................................82.4.1SHT11简介.....................................................................................................82.4.2SHT11端口介绍.............................................................................................92.4.3SHT11典型应用电路...................................................................................102.5显示模块..................................................................................................................102.5.1LCD1602概述..............................................................................................10V2.5.2LCD1602特性..............................................................................................112.5.3LCD1602引脚说明......................................................................................112.6按键电路..................................................................................................................152.7报警电路.................................................................................................................16第三章系统软件设计.....................................................................................................193.1系统主程序设计方法.............................................................................................193.2LCD1602显示子程序.............................................................................................20