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    基于单片机的节水灌溉自动控制系统的设计说明书.doc

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    基于单片机的节水灌溉自动控制系统的设计说明书.doc

    黑龙江工程学院本科生毕业设计1目录摘要·········································································································Abstract········································································································第1章绪论····································································错误!未定义书签。1.1引言···········································································错误!未定义书签。1.2选题背景及研究的目的与意义·······································错误!未定义书签。1.2.1选题背景···························································错误!未定义书签。1.2.2研究的目的与意义··············································错误!未定义书签。1.3研究内容····································································错误!未定义书签。1.4节水灌溉控制系统国内外的研究现状及存在问题·············错误!未定义书签。第2章灌溉系统总体设计方案··········································错误!未定义书签。2.1计算机控制系统的基本形式··········································错误!未定义书签。2.2系统总体方案·······················································································72.2.1AT89C51微控器构成的最小系统······················································82.2.2数据采集部分···············································································82.2.3显示部分·····················································································92.2.4供电电源单元···············································································92.3本章小结····································································错误!未定义书签。第3章系统硬件电路设计··················································错误!未定义书签。3.1本系统的硬件设计概述·················································错误!未定义书签。3.2单片机的选择及分析············································································113.2.1单片机的定义和特点···································································113.2.2单片机的发展概况··············································错误!未定义书签。3.2.3本系统单片机的选择···································································123.3本系统硬件电路部分············································································163.3.1系统的工作原理·········································································163.3.2单片机主系统电路······································································173.3.3时钟电路···················································································173.3.4数据存储的扩展电路···································································183.3.5数据采集处理电路······································································193.3.6LED显示电路·············································································203.4电磁离合器异步电动机·········································································213.4.1电机概念介绍·············································································21黑龙江工程学院本科生毕业设计23.4.2电磁离合器电机结构及原理·························································213.5本章小结····························································································21第4章系统软件设计·················································································234.1本系统的主程序设计············································································234.2采样子程序设计··················································································254.3数据处理····························································································264.3.1采集数据转换·············································································264.3.2坐标变换···················································································274.3.3BCD转换····················································································304.4LED动态显示程序················································································314.5本章小结····························································································33结论·········································································································34参考文献······································································································35致谢·············································································································36黑龙江工程学院本科生毕业设计3摘要自动控制节水灌溉技术代表了农业现代化的发展状况,灌溉系统自动化水平比较低下是制约我国高效农业发展的主要原因。本文就此问题研究了基于单片机的节水灌溉自动控制系统,系统对土壤湿度进行监控,并按照农作物的要求进行适时适量的灌水,其核心部分是单片机控制部分,主要对灌溉控制技术以及系统的硬件设计,软件编程各个部分进行深入的研究。控制部分以单片机为核心,研制了一种基于单片机的节水灌溉自动控制系统。介绍了系统总体结构、单片机系统主机电路、数据采集处理电路、I/O口的扩展电路。为了进行大规模灌溉工程的监控,采用分布式控制模式,以提高控制系统的可靠性、降低系统的成本。该套基于单片机控制的节水灌溉自动控制系统造成本低,体积小、安装方便、抗干扰性强、运行可靠,相比其他控制方式来说,性价比高,更易形成产品,便于推广应用。这是我国灌溉自动控制技术的一种新尝试,为目前农业在较低生产力水平的状况下,向智能化、市场化方向发展开辟了一条新途径。关键词:AT89C51单片机;湿度传感器;A/D转换;采样;芯片黑龙江工程学院本科生毕业设计4ABSTRACTThelevelofauto-controlwater-savingirrigationtechnologyreflectsthedevelopmentconditionofagriculturemodernization.Thelowautomaticlevelofirrigationsystemisthemainreasonthatpreventedouragriculturesdevelopment.Astothiscondition,thispapermainlystudiesthewater-savingirrigationsystemthatcontrolledbyMCU.Thissystemcansupervisehumidity.itcanirrigatetothedemandofthefarmcropswithrightamuntofwateratwelltime.ThecontrolpartthatconsistsofMCUisitscore.Researchworkhadbeencarriedonirrigationcontroltechnology,hardwareandsoftwareprogramandso.ThecontrolthatconsistsofMCUisitscore.Asetofautomaticwater-savingsystemwhichiscontrolledbysing-chipcontrollerhavebeendevelopedinthispaper.Theoverallstructureofsystem、themaincircuitoftheMCUsystem、data-collectingcircuit、I/Oexpandingcircuitareallthedesigned.Formonitoringlarge-scaleirrigationsystem,weusedistributionalcontrolmodeltoenhancestabilityofthesystemdereducethecost.Itissmall,easytofit,astrongcapabilitytoresistinterfereandlow-cost.Sothecontrolsystemismoreeconomiccomparedtoothercontrolsystemsuchasthutersystemandallthesedemonstratethisproductionisadepttobepopularized.Thisworkisafreshattempttobringouragricultureintoanadvancedstage,whichnowisrelativetobebackwardgreenhousecontroltechnique,especiallyontheaspectofnutrientliquidsupplyingwhencropscultivatedontissue.Keywords:AT89C51MCU;HumiditySensor;A/Dtransform;Sampling;Chip

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