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I摘要目前漏水现象经常发生在工业现场，漏水一直以来是导致水资源浪费和发生事故的关键因素，为了减少损失和防止事故扩大，漏水检测是非常必要和重要的。本设计是采用RS485通信方式的漏水检测控制系统。下节点完成现场检测、控制、记录、报警，同时在网上远传。上节点完成远程监控。主机采用计算机，从机以单片机AT89S52为主控制器，由信号处理模块、A/D转换模块、报警模块、显示模块、电源模块、键盘模块，电磁阀驱动模块等外围电路组成。传感器实时监测漏水信号，发生泄漏时，输出0-20mV电压信号，系统接收漏水信号进行报警和定位泄露位置自动关闭相应水阀。本系统采用MCGS设计界面，用于显示检测画面，当出现故障时，相应显示画面自动跳出，显示故障点，实现对整栋办公大楼的模拟监控。本漏水检测控制系统具有实时性能好、成本低、运行安全可靠等优点，及时的解决了办公大楼各个场所的漏水检测问题。关键词：AT89S52；模拟监控；漏水检测；RS485通信IIAbstractLeakagephenomenaoftenoccursintheindustrialfieldatpresent,leakingisalwaysthekeyfactorofleadingtowaterwastageandaccidents.Inordertoreducethelossandaccidentprevention,leakdetectionisverynecessaryandimportant.ThisdesignistoadoptRS485communicationmodeofleakagedetectionandcontrolsystems.Nodecompletesthescenedetection,control,recordandalarm,remotestransmissionontheInternetatthesametime.Thecompleteremotemonitoringnodes.Hostcomputerfromthemachineisgivenprioritytowithsingle-chipmicrocomputerAT89S52controller,thesignalprocessingmodule,A/Dconversionmodule,alarmmodule,displaymodule,powermodule,keyboardmodule,peripheralcircuitofelectromagneticvalvedrivemodule,etc.Sensorreal-timemonitoringoftheleakagesignal,leak,0-20mvvoltagesignal,thesystemwhichreceivestheleaksignalalarmandlocatesleakpositioncorrespondingwatervalveshutoffautomatically.ThesystemUSESMCGSdesigninterface,whichisusedtodisplayimageswhenfaultoccurs,thecorrespondingdisplayautomaticallyjumpoutandshowthefailurepoint,whichrealizesthesimulationofthewholeofficebuildingmonitoring.Theleakagedetectioncontrolsystemhasgoodreal-timeperformance,lowcost,safeandreliableoperationandsoon,whichcansolvetheofficebuildingeachplacesleakingproblemintime.Keywords：AT89S52；Simulationmonitoring；Waterleakagedetection；RS485communicationIII目录第1章绪论..........................................................................................................11.1课题的来源及意义...................................................................................11.2国内外研究现状.......................................................................................21.3论文研究的内容.......................................................................................3第2章系统总体设计............................................................................................42.1概述...........................................................................................................42.2方案论证...................................................................................................42.2.1控制模块论证................................................................................42.2.2电源模块论证................................................................................62.2.3显示模块论证................................................................................62.2.4键盘模块论证................................................................................72.3设计要求...................................................................................................72.4系统总体框图...........................................................................................8第3章硬件设计....................................................................................................93.1单片机最小系统设计...............................................................................93.2传感器的选择.........................................................................................113.3多路转换开关选择.................................................................................133.4放大电路.................................................................................................143.5滤波电路.................................................................................................153.6V/I转换电路...........................................................................................163.7I/V转换电路...........................................................................................173.8隔离电路.................................................................................................183.9A/D转换电路.........................................................................................193.10显示电路...............................................................................................213.11电源电路................................................................................................223.12电磁阀的选择.......................................................................................243.13电磁阀驱动电路...................................................................................263.14报警电路...............................................................................................273.15单片机I/O扩展....................................................................................283.16RS485通信电路...................................................................................29IV3.17键盘电路...............................................................................................32第4章软件设计..................................................................................................334.1主程序流程图..............................................