瓦斯环境监测及报警毕业论文

I矿井环境监测及报警装置的设计作者姓名:周军专业班级:2010060505指导教师:李琳琳张志程摘要瓦斯浓度的监测器在监测煤矿井下安全状况和防范安全隐患方面起着重要作用。本设计用传感器MQ-2采集甲烷变成电流信号，将电流信号通过LM358进行放大，再传到STC89C52RC单片机进行处理。瓦斯浓度监测结果通过LCD1602显示出来，当甲烷浓度超过规定的浓度，就进行声光报警，同时自动启动通风装置。它适合各类煤矿瓦斯的监控，可以大大降低煤矿事故的发生，降低企业成本，提高煤炭开采率，为我国煤炭事业做出贡献。在实验室环境下完成瓦斯浓度检测报警电路，实现检测报警基本功能，并在超限时启动风机。关键词：STC89C52RC单片机；MQ-2；声光报警器；LCD1602IIDesignmineenvironmentalmonitoringandalarmdevicesAbstract:TheMonitorofgasconcentrationmonitorthesecuritysituationinthecoalminemonitoring,itplaysanimportantroleinpreventingsecurityrisks.ThissystemusesthesensorcalledMQ-2tocapturetheconcentrationchangesofmethanewhichcanbecomethecurrentsignal,Then,thecurrentsignalisamplifiedbyLM358,andspreadtoSTC89C52RCmicrocontrollerforprocessing.TheconcentrationresultsofmonitoringthroughtheLCD1602todisplay,whentheconcentrationofmethaneexceedstheprescribedconcentration,itleadstoSoundandlightalarmsystem,andautomaticallystarttheventilation.Itisalsosuitableforalltypesofcoalminegasmonitoring,whichcangreatlyreducetheoccurrenceofcoalmineaccidents,reducecostsandimprovetherateofcoalmining,itcontributsetoChina'scoalindustry.Thegasconcentrationdetectionalarmcircuitisfinishedinalaboratoryenvironment,itachievesabasicfunctionsofdetectionalarmandstartsthefanwhenoverrun.Keywords：STC89C52RCmicrocontroller;MQ-2;soundandlightalarm;LCD1602III目录第1章前言....................................................................................................................11.1瓦斯监测历史与发展.........................................................................................11.1.1瓦斯监测特点..........................................................................................21.1.2研究目的与研究内容..............................................................................2第2章系统设计..............................................................................................................32.1系统整体设计.....................................................................................................32.2主要器件选择.....................................................................................................32.2.1微控制器的选择......................................................................................42.2.2运算放大器的选择..................................................................................42.2.3瓦斯传感器的选择..................................................................................4第3章系统的硬件电路设计..........................................................................................63.1传感器电路.........................................................................................................63.1.1MQ-2的结构............................................................................................63.1.2MQ-2工作原理........................................................................................63.2运算放大电路.....................................................................................................73.3STC89C52RC单片机.........................................................................................73.3.1STC89C52RC芯片概述..........................................................................73.3.2STC89C52RC引脚功能说明..................................................................83.4声光报警电路...................................................................................................103.51602型LCD显示器结构与原理.....................................................................113.5.1LCD显示器结构....................................................................................113.5.2LCD显示器介绍和指令........................................................................113.5.3LCD显示器的接口设计........................................................................123.6时钟电路设计...................................................................................................133.7自动通风电路设计...........................................................................................14第4章监测系统软件编程与系统仿真........................................................................164.1软件设计总述...................................................................................................164.2开发软件的选择...............................................................................................16IV4.3软件功能实现...................................................................................................174.4Proteus和Keil软件介绍及使用......................................................................174.4.1Proteus介绍及使用................................................................................184.4.2Keil软件介绍及使用.............................................................................184.5仿真及调试过程...............................................................................................19第5章实物制作............................................................................................................215.1实物器件接线与实物电路...............................................................................215.1.1甲烷传感器接线....................................................................................215.1.2显示器的