基于单片机的烟雾检测报警系统教材.doc

摘 要 据相关统计，随着家用电器的普及，家庭用电量正呈逐年上升的趋势，家庭火灾发生的频率也越来越高，火灾报警器也随之被广泛应用于各种场合。运用多传感器结合单片机能够有效解决灵敏度与报警准确率之间的矛盾，本文利用单片机结合技术而开发设计了这一 Abstract According to relevant statistics, as household appliances popularization,family electricity use is increasing year by year, family fire occurrence frequency is also more and more high, fire alarm has subsequently been widely applied in all kinds of situations. By using microcontroller can effectively solve the sensor with sensitivity and alarm accuracy. In this paper, combined with the use of single-chip sensor technology development and design of the smoke control system. This protect designs a better smoke alarm with MQ-2 smoke sensor, DS18B20 temperature sensor and AT89S52 type MCU as the core, and combines with other electronic technology. Each module is controlled by the MCU for monitoring the smoke, fire, and other information in real-time and the MCU will process the information. It can realize a series of functions such as sound and light alarming, the smoke density and the temperature being demonstrated. It is one kind of structure simple, the performance stable, easy to operate, the price inexpensive, the intellectualized smog alarm apparatus and has certain practical value. Thesis give detailed introduction for the function and theory of the various component parts of the alarm system, focus on the interface technology between its main controlled circuit and peripheral circuit, also give explanation of the software . Key words: smoke; alarm; MCU; sensor 目 录 第1章 概述 1 1.1 论文选题背景、目的和意义 1 1.2 烟雾报警器的国内外现状 2 1.3 本论文研究的主要内容 2 第2章 系统总体设计方案 3 2.1 烟雾检测报警器设计思路 3 2.2 烟雾传感器的选型 3 2.3 单片机的选型 8 2.4 DS18B20温度传感器的介绍 12 2.5 本章小结 16 第3章 系统的硬件电路 17 3.1 AT89S52单片机最小系统电路 17 3.2 烟雾信号采集及A/D转换电路 18 3.3 温度采集电路 20 3.4 LCD显示电路 20 3.5 蜂鸣器报警电路 22 3.6 继电器控制电路 23 3.7 按键电路 23 3.8 本章小结 24 第4章 软件设计 25 4.2 主程序初始化流程图 25 4.3 按键控制子程序流程图 25 4.4 报警子程序流程图 26 4.5 主程序设计及流程图 27 4.6 本章小结 28 结 论 29 参考文献 30 致 谢 31 附 录 32 附录1：程序: 32 附录2：电路图 44 第1章 概述 论文选题背景、目的和意义 1.1.1 论文选