本科基于AT89C51单片机的自动火灾报警系统设计.doc

摘 要 全世界几乎每天都有火灾发生。城里的高层建筑，地下商场以及大型的建筑群日益增多。火灾的隐患也伴随着社会的发展而逐年升高。自动火灾报警系统就是为了保障人民生命财产安全而发明的，并且随着现代技术水平的不断提高。在方式，功能，和结构上不断的完善。 以AT89C51单片机和MQ-2型半导体电阻式烟雾传感器为核心设计的烟雾报警器可实现报警、故障自诊断、浓度级别显示、报警设置、温度显示及与温度报警值设定等功能。是一种结构简单、性能 稳定、使用方便、价格低廉、智能化的烟雾报警器。具有一定的实用价值。 关键词：报警器；AT89C51；传感器 ABSTRACT Fire almost every day all over the world. With the development of socialist modernization，the city of high-rise buildings，underground shopping malls and large buildings is increasing. The hidden danger of the fire also increased year by year along with the development of the society. Cruel calamity，it is the people understood that with the increasing of social wealth，the development of social economy，the dangers of fire brings us constantly expanding. He destroyed not only material wealth. But also caused the social anxiety and confusion. Also directly threaten the safety of life，to the soul of people caused great trauma，reduce unnecessary loss for the people. Automatic fire alarm system is to protect peoples life and property safety and invention，and with the continuous improvement of modern technology. In a way,the function，and structure. AT89C51 and MQ - 2 type semiconductor resistance type smoke sensor as the core design of the smoke alarm can realize alarm,fault self-diagnosis，concentration level display，alarm limit setting，temperature and the temperature alarm value set. Is a kind of simple structure， stable performance，easy to use，low cost， intelligent smoke alarm. Has a certain practical value. Keywords: smoke alarm；AT89C51；sensor； 目 录 TOC \o 1-3 \h \u HYPERLINK \l _Toc23362 1、绪论 PAGEREF _Toc23362 1 HYPERLINK \l _Toc1477 1.1课题的背景及其意义 PAGEREF _Toc1477 1 HYPERLINK \l _Toc14325 1.2发展趋势 PAGEREF _Toc14325 1 HYPERLINK \l _Toc13032 1.3现状与特点 PAGEREF _Toc13032 2 HYPERLINK \l _Toc22904 1.4系统的研究范围 PAGEREF _Toc22904 3 HYPERLINK \l _Toc31678 2、 自动火灾报警系统整体方案设计 PAGEREF _Toc31678 5 HYPERLINK \l _Toc32383 2.1火灾的特点 PAG