库房温湿度测控系统设计(包含电路原理图、PCB封装、软件程序)

毕业设计院系名称仪器科学与光电工程学院2012年5月26日设计题目库房温湿度测控系统的设计学生姓名学号专业班级指导教师目录中文摘要：..........................................................................................................................1英文摘要：..........................................................................................................................21引言..................................................................................................................................31.1课题意义...................................................31.2国内外发展现状及趋势.......................................42系统设计的任务分析和方案选择..................................................................................62.1系统的主要性能指标.........................................62.2系统设计的方案选择.........................................62.2.1温湿度传感器.............................................................................................62.2.2控制芯片AT89S51单片机........................................................................92.2.3显示模块..................................................................................................112.3系统设计方案的工作原理....................................123系统硬件电路设计........................................................................................................133.1单片机控制电路设计........................................133.2液晶显示电路设计..........................................143.3温湿度测控系统电路设计....................................153.4键盘电路设计..............................................173.5报警电路设计..............................................183.6看门狗电路设计............................................183.6.1MAX813L芯片介绍.......................................193.6.2看门狗电路设计......................................................................................203.7电源电路设计..............................................214系统软件设计................................................................................................................234.1主程序设计................................................234.2液晶显示设计..............................................244.3SHT11初始化设计..........................................27结论..................................................................................................................................29致谢..................................................................................................................................30参考文献............................................................................................................................31附录1：系统的电路原理图.............................................................................................32附录2：系统的PCB图.....................................................................................................33附录3：系统的软件程序源代码.....................................................................................341库房温湿度测控系统的设计中文摘要：温度和湿度是两种最基本的环境参数，与人们的生活环境息息相关，在工业生产和日常生活中，温度和湿度是需要测量和控制的重要参数。物体的许多物理现象和化学性质都与温度、湿度有关，许多生产过程都是在一定的温湿度范围内进行的，因此需要测量和控制温湿度。该课题是对库房和花房内温湿度的监测及电路设计的研究。利用单片机实现的高精度实用性温湿度控制系统可广泛应用于库房的仓储管理，花房等需要温湿度控制的场所。针对现有的设备大多数只监测温度而忽视湿度的问题进行思考并提出解决方案，最终设计出实用性高、价格低廉的监测系统。本次设计的温湿度控制系统以AT89C2051单片机为控制核心，采用温湿度传感器SHT11作为检测元件，结合MAX813L看门狗构建了温湿度监控系统。实现单片机发出控制命令，传感器进行数据采集，将采集到的模拟信号转换为计算机能够识别的数字信号，通过mgls12864液晶显示屏显示实时温度和湿度，超出或者低于用户的设定值时由蜂鸣器报警，并由温湿度调节系统对环境温度、湿度进行调节，从而完成的系统可以方便地实现温度、湿度的有效实时显示和控制的要求，降低经济损失和劳动强度，提高产品的性价比。关键词：单片机SHT11温湿度传感器测控系统液晶显示2Abstract：Temperatureandhumidityaretwoofthemostbasicenvironmentalparameters,andpeople'slivingenvironmentiscloselyrelated.intheindustrialproductionanddailylife,temperatureandhumidityaretheneedtobemeasuredandcontrolled.Thesubjectisonmonitoringanddesigningcircuittemperatureandhumidityofthestoreroomsandflowerrooms.TemperatureandhumiditycontrolsysteminusingSingle-chipwhichishigh-precisionandpracticalitycanbewidelyappliedtothestoreroomsmanagement,theflowerroomsinneedofcontrollingtemperatureandhumidityandsoon.Formostoftheexistingequipmentswhichonlymonitortemperatureandignorehumiditythinkaboutandputforwardasolution,designahighavailabilityandlowcostmonitoringsystemfinally.ThedesignedtemperatureandhumiditycontrolsystemtakesAT89C2051microcontrollerasthecontrolcentre,usestemperatureandhumiditysensorSHT11asthedetectionelement,andbuildstemperatureandhumiditymonitoringsystemcombinationoftheMAX813LWatchdogTimer.Whencansentcommandsbythesingle-chipprocessor,thesensorbeginstocollectdataandconvertAnalogtoDigitalthatcanberecognizedbycomputer.TheINTERICBUSsendthedatatothestoreunittothesingle-chipprocessor,anddisplaybymgls12864LCDdisplayingreal-timetemperatureandhumidity.Whentemperatureandhumidityarebeyondorbelowtheusers'settings,thebuzzeralarms.Beadjustedbythetemperatureandhumidityregulationsystemtoambienttemperature,humidity,thuscompletingthesystemcaneasilyachievetherequirementsofeffectivereal-timecontroloftemperatureandhumidity,reduceeconomiclossesandlaborintensity,improvethecost-effective.Keywords:Single-chipSHT11sensorsTemperatureandhumiditymeasurementliquidcrystaldisplay31引言1.1课题意义目前，国内大中型库房在仓储管理和花房等需要温湿度控制的场所的现状，多数仅限于对温度进行监测和控制，而没有对湿度采取相应的措施。当温度不正常时（过