摘要：当今世界经济和人民生活水平日益发展，人们也越来越注意自身生活质量与安全。煤气作为一种重要的不可或缺的能源早已进入到了千家万户，在带来方便的同时也带来的其不可预估的危险。煤气中最主要的成分是一氧化碳，一氧化碳无色无味，易燃烧，易爆炸，人体吸入后会引起中毒反应，危及生命。所以对于煤气泄露的监测与应急处理也随之成为研究的热点。本设计提出一种基于单片机的煤气泄漏检测系统的设计方案，该方案以STC89C52单片机与气体传感器为核心。使用MQ-7气体传感器对煤气浓度进行检测，将气体浓度检测结果转换为模拟信号，再由AD转换器将检测到的模拟信号转换成数字信号后给STC89C52单片机进行信号处理，实现对煤气浓度的检测与报警。此系统具有成本低，准确率高，稳定性高等特点。92771

毕业论文关键词：煤气监控系统，气体传感器，单片机，报警

Abstract:With the development of the world economy and people's living standard, people pay more and more attention to their own quality of life and safety。As an important and indispensable source of energy, gas has already entered into thousands of households, which brings about the risk of being unable to be estimated at the same time。The most important component of the gas is carbon monoxide, carbon monoxide colorless and tasteless, easy to burn, easy to explode, the human body will cause toxic reactions after inhalation, life-threatening 。Therefore, the monitoring and emergency treatment of gas leakage has become a hot spot。 This design puts forward a design scheme of gas leak detection system based on single chip microcomputer, which is based on STC89C52 MCU and gas sensor。 The gas concentration was detected using MQ-7 gas sensor, gas concentration detection results will be converted to analog signals by AD converter converts the signal to the microcontroller STC89C52 signal processing, realize the detection and alarm of gas concentration, and has the function of exhaust fan。 This system has the characteristics of low cost, high accuracy and high stability。

Keywords:gas monitoring system，gas transducer，microcontroller， alarm 

目录

1 绪论 5

1。1研究的背景与意义 5

1。2煤气泄漏监控系统的研究设计现状 5

1。3 设计任务的分析 6

2系统方案选择与分析 6

2。1 系统方案分析 6

2。1。1 主控芯片方案 6

2。1。2数据采集系统方案 8

2。1。3显示模块方案 9

2。2系统方案选择 10

2。2。1 监控模块 10

2。2。2 报警显示模块 10

3硬件设计 11

3。1 电源电路 11

3。2 单片机最小系统 11

3。2。1 单片机简介 12

3。2。2 晶振电路 12

3。2。3 复位电路 13

3。3 煤气浓度采集电路 13

3。3。1 MQ-7简介 13

3。3。2 煤气浓度采集电路 14

3。4 AD转换电路 15

3。4。1 ADC0832简介