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1、TianjinUniversityofTechnologyandEducation毕业设计智能灌溉系统的设计DesignofIntelligentIrrigationSystem摘要近几年来，随着全球水资源的日趋紧张，世界各国都在积极探索行之有效的节水途径和措施。自动控制节水灌溉技术的高低代表着农业现代化的发展状况，灌溉系统口动化水平较低是制约我国高效农业发展的主要原因，节水灌溉作为一项现代化的工程技术，无论是工程节水、农业节水，还是管理节水都必须建立在节水灌溉设备实现产业化生产的基础上。节水灌溉技术是为了解决水资源不足，提高灌溉效率而发展起來的现代灌溉技术z-o木课题设计了一个智能灌溉系统，
2、该系统以AT89S52单片机为控制核心，采用模块化的设计方案，由温湿度采集模块、时钟模块、步进电机控制模块、键盘接口模块和液晶显示模块组成。温湿度采集模块以DHT11温湿度传感器为核心，时钟模块主要由DS1302和32.768kHz的晶体组成，步进电机控制电路模块采用了达林顿驱动芯片ULN2003,显示电路模块主要由LCD12864构成。在闭环（自动）模式下，该系统能自动对土壤的温湿度进行检测，当实际湿度低于警戒值时单片机口动启动步进电机进行灌溉。关键词:AT89S52；DHT11温湿度传感器；ULN2003达林顿驱动；LCD12864；DS1302ABSTRACTInrecentyears,
3、alongwiththeglobalwaterresourcesisnervous,countriesintheworldexploreactivelyeffectivewaysandmeasuresofwater-saving.Automaticcontrolthediscretionofwater-savingimgationtechnologiesrepresentstheagriculturalmodernization,lowlevelofthedevelopmentsituationofirrigationsystemautomationbecomethemaincauseofre
4、strictinghigh-efficientagriculturedevelopment,water-savingirrigationisamodemengineeringtechnology,whetherengineeringsectionwater,watersaving,ormanagementofagriculturalwatermustbebasedonthebasisofwater-savingirrigationequipmentrealizingindustrializationproduction.Water-savingirrigationtechniqueisused
5、todealwiththewatershortage,improveirrigationefficiencyandbedevelopedintooneofthemodemirrigationtechniques・Thistopicdesignanintelligentirrigationsystem,thissystemselecttheAT89S52SCMascontrolcore,adoptthemodularizingdesignscheme,whichcontainthetemperatureandhumidityacquisitionmodule,PHvaluedetectionmo
6、dule,clockmodule,steppingmotorcontrolmodule,keyboardinterfacemoduleandLCDmodule.DHT11andhumiditysensorisselectedasthecoreoftemperatureandhumidityacquisitionmodule,clockmoduleismainlycomposedoftheclockDS1302andcrystalof32.768kHz,steppingmotorcontrolcircuitmoduleadoptedreachlintondrivechipULN2003,disp
7、laycircuitmoduleismainlyconsistedoftheLCD12864constitutes.Intheloop(automatically)mode,thesystemcanautomaticallydetectonsoiltemperatureandhumidity,whenactualhumidityunderalertvaluesingle-chipmicrocomp
