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精品2012届毕业生毕业设计说明书题目:恒温恒湿试验箱控制系统的设计院系名称：电气工程学院专业班级：电气F0802学生姓名：学号：200848720201指导教师：教师职称：讲师2012年5月30日精品摘要随着我国现代农业的发展和工业产品研制的需要，恒温恒湿试验箱的应用越来越广,生产、科研对它的要求也越来越高。要求它的性能价格比更高,使用寿命更长,使用费用更少(省电),响应速度更快。近几年来，我国从国外引进了大批试验系统，为我国工业产品的研制和定型发挥了重要作用，但由于其本身的复杂性，使得试验箱在运行中出现了许多问题，而且出现了问题不能及时解决，大大延长了试验周期，影响了产品的研制工作。而产生这些现象的原因是对综合试验的工作原理不了解。为此，本文对试验箱的基本工作原理作出了一些简要阐述。恒温恒湿试验箱是利用一定的方式将箱内的温度和湿度调节到给定值，并在该条件下进行实验，达到实验反应要求。即能同时施加温度、湿度应力的试验箱。简而言之是指温度和湿度都能控制在指定范围内的试验箱。恒温恒湿试验箱主要用于检测材料在各种环境下的性能的设备，并可试验各种材料耐热、耐寒、耐干、耐湿性能。适合电子、电器、通讯、仪表、车辆、食品、化学、建材、医疗、航天等制品检测质量之用。关键词：恒温恒湿试验箱单片机控制系统限温报警系统精品TitleTheDesignofConstantTemperatureandHumidityChamberControlSystemAbstractWiththedevelopmentofChina'smodernagricultureandtheneedofindustrialproductsdeveloped,theapplicationsoftheconstanttemperatureandhumidityboxbecomemorewidely.production,scientificresearchanditsincreasinglyhighrequirements.highercost-effective,longerlife,lesscosts(saving)andfasterresponsearerequired.Inrecentyears,ourcountryhasimportedalargenumberoftestsystemsfromabroad,whichhasplayedanimportantroleinthedevelopmentofChina'sindustrialproductsandstereotypes,However,duetoitsowncomplexity,makingthechamberalotofproblemsintheoperation,andproblemscannotbesolvedpromptly,whichgreatlyprolongthetestcycle,affectingtheproductmanufacturework.Thereasonofthesephenomenaisdonotunderstandtheworkingtheoryofthecomprehensivetest.So,wemadesomebriefdescriptionofthebasicworkingtheoryofthechamber.Theconstanttemperatureandhumidityboxisaboxwhichcanadjustthetemperatureandhumidityinsidetothesetpointinacertainway,theexperimentsandtheresponserequirementsoftheexperimentalunderthiscondition,whichcanimposedtemperatureandhumiditystresstothechamberatthesametime.Inshort,itisaboxwhichcanputthetemperatureandhumiditywithinaspecifiedrange.Theconstanttemperatureandhumiditychamberisthedevicethatmainlyusedforthedetectionperformanceofmaterialsinvariousenvironments,whichCanexperimentvariousmaterialsperformanceofheat,cold,resistancetodryandmoisture.useingforthetestingqualityofelectronic,electrical,communications,instrumentation,vehicles,food,chemical,buildingmaterials,medical,aerospaceandotherproducts.KeywordsConstantTemperatureandHumiditySingleChipControlSystemLimitTemperatureAlarmSystem精品目次1绪论.............................................................................................................................11.1文献综述..................................................................................................................11.2课题的主要内容......................................................................................................11.3课题的研究方案......................................................................................................12设计的理论基础.........................................................................................................32.1单片机的发展概况...................................................................................................32.2AT89C51单片机系列介绍.......................................................................................32.3DS18B20数字温度传感器.......................................................................................42.4KSC-6V湿度传感器................................................................................................42.5RS-232总线接口芯片MAX232.............................................................................53硬件电路设计.............................................................................................................63.1主控模块设计..........................................................................................................63.2硬件系统电路连接设计..........................................................................................84PID控制算法.............................................................................................................114.1PID控制的发展......................................................................................................114.2PID控制理论..........................................................................................................114.3PID控制算法..........................................................................................................125软件设计...................................................................................................................145.1软件设计综述........................................................................................................145.2软件流程图............................................................................................................14结论...............................................................................................................................19致谢...............................................................................................................................20参考文献.......................................................................................................................21精品1绪论1.1文献综述1.1.1国内恒温恒湿试验箱的状况对温湿试验箱的研究主要集中于制冷和加热方式选择、控制精度与测试监控、设备的结构等方面，对温湿箱非稳态温变过程传热特性方面的研究不多，很少研究热力系统的耦合。对于湿度，现在多已采用温湿度独立调节方式，这样