家用燃气报警器毕业设计论文

（二0一二年六月本科毕业设计说明书学校代码：10128学号：200810107021题目：家用燃气泄漏报警装置的设计学生姓名：学院：机械学院系别：测控系专业：测控技术与仪器班级：测控08-1指导教师：高级实验师内蒙古工业大学本科毕业设计说明书摘要燃气(人工煤气、天然气)的普及，为市民提供了方便，也提高市民的生活质量，但是任何事物都有它的两面性，在使用燃气的过程中，因燃气泄漏等原因造成的燃气爆炸、中毒等意外事故时有发生，给人们的生命和财产安全带来了严重的威胁，因此安全使用燃气，是不可忽视的一个重中之重的工作。家用燃气泄漏报警装置能有效监测环境中可燃气体(如CH4)的浓度，一旦其浓度超出报警限定值，就能发出声光报警信号，并且能随着浓度的增加报警音量逐渐加大，能及时起到安全防范的作用。本设计所研究的可燃性气体报警系统包括：气体信号采集电路、调理电路、模数转化电路、单片机系统电路、报警电路组成，首先利用传感器对可燃气体浓度信号进行监测并且转变成电压信号，选择合适的放大电路，将电压放大到A/D所要求的电压，经过模数转换，将检测的电压值送入单片机，在单片机内完成与设定的电压信号进行比较，当气体浓度超标时，驱动声音和灯光报警。关键词：传感器；报警器；单片机内蒙古工业大学本科毕业设计说明书AbstractWiththepopularityofGas,forexample(artificialcoalgas,naturalgas),Itisprovideaconvenienttocitizensandimprovethequalityoflives,Buteverycoinhasitstwosides,attheuseofgasintheprocess,gasexplosioncausedbygasleak,Sothatpoisoningandotheraccidentshaveoccurred,Itisharmforpeopleandpropertyandbringstheseriouslythreattothesafeuseofgasatthesametime,TheDomesticgasleakagealarmdevicecaneffectivelymonitortheenvironmentofcombustiblegases(suchasCH4)leakage,Onceitsconcentrationbeyondthealarmlimitvalue,cansendoutsoundandlightalarmsignals,andwiththeincreasingconcentrationofalarmvolumeincreasedgradually,Thealarmplaysasignificantrole.thesensorespeciallygassensorsusageanduseresearchareneeded.Thedesignandresearchofthefamilygasalarmsystemincludes:gassignalacquisitioncircuit,analog-to-digitalconversionelectriccontrolcircuit,Thesignalsaremonitoredandconvertedintovoltagesignal,selecttheappropriateamplificationcircuit,thevoltageamplificationtotherequirementoftheA/Dvoltage,afteranalog-digitalconversion,thedetectedvoltagevalueintothemicrocontroller,intheMCUcompletedwithinthevoltagesignaliscomparedwiththeset,whenthegasconcentrationexceedthestandard,drivethesoundandlightalarm.Keywords:sensor；alarm；SCM内蒙古工业大学本科毕业设计说明书目录引言...........................................................................................................................1第一章概述.............................................................................................................21.1家用燃气泄露报警的概述...............................................................................21.2家用燃气泄露报警的发展...............................................................................21.3家用燃气泄露报警研究的目的与意义...........................................................3第二章燃气检测传感器的选择.................................................................................42.1气体传感器的选型...........................................................................................42.1.1气体传感器介绍.....................................................................................42.2.2气体传感器的主要参数和特性.............................................................72.2.2气体传感器的选定.................................................................................82.2.3MC101介绍...........................................................................................8第三章家用燃气泄露报警装置的硬件部分设计...................................................113.1系统硬件电路总体设计.................................................................................113.2家用燃气报警器的功能.................................................................................113.2.1声光报警功能.......................................................................................113.2.2标准工作条件.......................................................................................113.2.3外围接口电路的设计...........................................................................163.2.4A/D转换主要技术指标.......................................................................183.2.5单片机与ADC0808接口电路............................................................183.2.6串口转并口芯片74HC164..................................................................193.2.7数码管显示...........................................................................................203.2.8声音灯光报警电路...............................................................................223.3总电路设计.....................................................................................................22第四章燃气泄漏报警系统的软件部分设计...........................................................244.1软件设计重要性............................................................................................244.2主程序设计流程图........................................................................................244.3软件设计的子程序基本思想........................................................................284.3.1A/D转换................................................................................................284.3.2浓度转换...............................................................................................294.3.3数码显示..............................................................................................30内蒙古工业大学本科毕业设计说明书结论.........................................................................................................................32谢辞.........................................................................................................................33参考文献...............................................................................