本科毕业设计
基于单片机的室内天然气浓度检测系统设计
摘 要
随着经济和科学技术的快速发展，人们对生活质量的提高和生活环境的改善越来越重视。天然气作为一种清洁型能源进入家庭得到广泛使用为人们的生活带来了方便，但同时也带来了潜在的危险，天然气在使用过程中，若管道和阀门密封不好，一旦泄漏出去极易爆炸，危及人们的生命财产安全。鉴于这些原因，对于天然气的检测与控制就变得异常重要了，研究天然气浓度的检测报警与控制也随之成为一个重要课题。
本设计以半导体气敏传感器和单片机技术为核心设计的天然气泄漏报警系统可实现声光报警功能，是一种结构简单、性能稳定、使用方便、价格低廉、智能化的气体报警系统，具有一定的实用价值。本设计主要实现家庭天然气泄漏的检测与报警，系统主要以半导体气体传感器为研究对象，以单片机为核心构成一个具备数据采集、对象控制、结果显示等功能的完整系统。该系统分别控制报警灯、蜂鸣器及开启排风扇和切断电磁阀，实现对天然气泄漏的实时监测及控制，程序实时监测系统状态。
关键词：气体传感器；单片机；数据采集
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Abstract
With the rapid development of economy and the science technology, people pay more and more attention to the quality of life and the improvement of living environment . Natural gas are widely used in our daily life and brings convenience for people?s lives as a cleaner fuel, but also brings people with the potential dangers. If not sealed pipes and valves, they leaked,easily caused by fire，endangering people's lives and property . For the reason，so it is very important for us to inspect and control these natural gas well. And it is obviously very important to study on the inspection methods and sensors of all kinds of gases.
This papers to the semiconductor gas sensors and single chip microcomputer as the core design can realize the gas alarm sound-light alarm functions, is a kind of simple structure, stable performance, easy to use, inexpensive and intelligent gas alarm, has certain practical value. In this paper, the main gas leak measurement and alarm systems to the semiconductor gas sensor for the study in order to constitute a single-chip microcomputer as the core with data acquisition, object control, results showed that features such as data communication system of integrity. The system control the alarm light，buzzer and cut off the electromagnetic valve , the realization of the natural gas leak on the real-time monitoring and control; procedures real-time monitoring of system state.
Key words :gas sensor ; single chip microcontroller ;data acquisition
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