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东南大学成贤学院毕业设计报告（论文）诚信承诺本人承诺所呈交的毕业设计报告（论文）及取得的成果是在导师指导下完成，引用他人成果的部分均已列出参考文献。如论文涉及任何知识产权纠纷，本人将承担一切责任。学生签名：日期：东南大学成贤学院毕业设计报告I摘要随着社会的进步和人们生活水平的提高，煤气或天然气已经成为多数家庭的燃料，由于煤气泄露和使用天然气不当而引起的火灾给人们的生命财产安全带来了极大的隐患。防止煤气中毒与爆炸已成为人们的迫切需要，为此，我们设计了一种一氧化碳报警器。鉴于单片机AT89S52具有高集成度等优点，我们设计了一种基于AT89S52的一氧化碳报警器。该报警器对一氧化碳（CO）进行实时控制，当一氧化碳的浓度超过允许值时进行报警。为了提高系统的灵敏度和准确性，系统采用了一种十分稳定的传感器MQ-7。该传感器将置于测试环境中待测气体的浓度转换为模拟电压，再由模/数转换器ADC0809将模拟电压转换为数字信号，然后送入单片机AT89S52中进行处理。本设计正是实现ADC0809与AT89S52单片机的有机结合。此外还结合存储器AT24C02、液晶显示器LCD1602分别对检测数据进行存储和显示。关键词：一氧化碳；单片机；报警器；传感器；模数转换器；存储器；液晶显示器东南大学成贤学院毕业设计报告IIAbstractWiththesocialprogressandtheimprovementofpeople'slivingstandards,gasornaturalgashasbecomethefuelofmostfamilies,thefirecausedduetothegasleakingandtheimproperuseofnaturalgashasbroughtgreatriskstopeople'slivesandproperty.Topreventgaspoisoningandexplosionshavebecometheurgentneedsofthepeople,forwhichwedevelopedacarbonmonoxidealarm.InviewoftheMCUAT89S52hastheadvantagesofhighintegration,wedevelopanddesignacarbonmonoxidealarmbasedonit.Thealarmdoesareal-timecontroloncarbonmonoxide(CO),andalarmswhenthecarbonmonoxideconcentrationexceedstheallowablevalue.Inordertoimprovethesensitivityandaccuracyofthesystem,thesystemusesaverystablesensorMQ-7.Thesensorwillconverttheconcentrationsofthegas,whichisinthetestenvironment,toanalogvoltage.AndafterwardstheanalogvoltagewillbeconvertedtoadigitalsignalthroughtheAnalogtoDigitalConverterADC0809,andthenprocessedinthemicrocontrollerAT89S52.ThisdesignisjusttoachievetheorganiccombinationoftheADC0809andAT89S52microcontroller.Inaddition,thedesignalsocombinesthememoryAT24C02,LCDmonitorLCD1602torespectivelystorageanddisplaythedetectiondata.Keywords：Carbonmonoxide;MCU;Alarm;Sensor;AnalogtoDigitalConverter；Memory;LCDmonitor东南大学成贤学院毕业设计报告III目录摘要...............................................................................................................................................................IAbstract........................................................................................................................................................II第一章绪论................................................................................................................................................11.1课题背景和意义...........................................................................................................................11.2应用前景.......................................................................................................................................11.3一氧化碳报警器的概述...............................................................................................................21.4本次课题设计的目的...................................................................................................................21.5本次设计的主要任务...................................................................................................................2第二章器件介绍........................................................................................................................................32.1AT89S52单片机介绍....................................................................................................................32.1.1主要性能............................................................................................................................32.1.2与其它单片机相比的优缺点............................................................................................42.1.3端口功能............................................................................................................................42.2一氧化碳传感器介绍...................................................................................................................52.2.1传感器的定义和作用........................................................................................................52.2.2传感器的分类....................................................................................................................62.2.3传感器的发展趋势............................................................................................................62.2.4一氧化碳气体传感器MQ－7介绍..................................................................................72.3模数转换器ADC0809介绍.........................................................................................................82.3.1内部结构............................................................................................................................82.3.2引脚功能............................................................................................................................92.3.3工作过程..........................................................................................................................102.3.4特性参数..........................................................................................................................102.3.5ADC0809转换结束信号的处理......................................................................................102.4存储器AT24C02介绍...............................................................................................