毕业设计用纸
摘要
随着科技的发展，时代的进步，高楼大厦才能追上人类的脚步，伴随着家庭用火、用电量 的增加，所以火灾出现的可能性在持续加大，全国各地几乎每天都有不同情况的火灾在发 生，也正是因为这个原因，用来警示火灾的火灾报警器的地位越来越重要，在各种建筑内 被广泛使用。 该论文的主要研究对象为无线且具备多种功能的火灾报警器，该报警器使用的是利用气体 的传感器 MQ - 2、 ADC0832模数转换器以及温度传感器（型号为 DS18B20 ） ，以及用 STC89C51 作为主要核心进行控制的组件等来使基础功能得以实现。一旦在室内的温度， 或者是一定体积内的燃烧后产生的气体的浓度达到了传感器能够感知的临界值时，火灾警 示器就会通过声音和警示灯来提示可能发生火灾险情，让处于建筑物的人们能够及时逃生。
关键词：气体传感器 MQ-2；火灾报警；51 单片机；智能控制；DS18B20
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毕业设计用纸
ABSTRACT
With the development of science and technology, the progress of The Times, high-rise buildings to catch up with the pace of the human race,Along with the family in the fire, the increase of electricity consumption, and thus the fire frequency is higher and higher, almost all the fire in different regions, Fire alarm and therefore is widely applied to various occasions for warning of fire.This topic research the multi-function wireless fire alarm the STC89C51 as the core controller, using gas sensor MQ - 2, ADC0832 and DS18B20 temperature sensor to realize the basic functions.Through these sensors, when the concentration of combustible gas in the environment or indoor temperature changes, such as system have a corresponding light and sound alarm signals, to prompt the process of fire, let people to save his life.With the development of science and technology, the progress of The Times, high-rise buildings to catch up with the pace of the human race. Key words:MQ-2 gas sensor; fire alarm; MCU51; intelligent control；DS18B20
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毕业设计用纸
目录
摘要 .................................................................................................................................................. 1 ABSTRACT...................................................................................................................................... 2 1 绪论 ............................................................................................................................................... 4
节 1.01 节 1.02 节 1.03 节 1.04 1.1 课题的研究背景 ........................................................................................................... 4 1.2 课题的研究目的与意义 ........................................................................................... 4 1.3 火灾报警器的发展与现状 ....................................................................................... 5 1.4 课题的研究内容 ....................................................................................................... 5
2 火灾报警器的总体方案设计 ........................................................................................................ 6
节 1.05 2.1 系统的功能要求 ....................................................................................................... 6 节 1.06 2.2 系统的技术要求 ....................................................................................................... 6 2.3 系统的组成及方案设计 ................................................................................................................ 6
3 系统的硬件设计............................................................................................................................ 8
3.1 主控电路 ........................................................................................................................................ 9 3.2 烟雾探测电路的设计 .................................................................................................................. 12 3.3 显示电路设计 .............................................................................................................................. 13 3.4 声光报警提示电路 ...................................................................................................................... 14
3.4.1 灯光提示电路 ................................................................................... 14 3.4.2 声音报警.......................................................................................... 14
3.5 温度采集电路 .............................................................................................................................. 15
3.5.1 DS18B20 概述 .................................................................................. 15 3.5.2 DS18B20 引脚介绍 ............................................................................ 16 3.5.3 DS18B20 的内部结构......................................................................... 16
3.6 按键电路 ...................................................................................................................................... 17
5 火灾报警器的测试结果及结论 .................................................................................................. 18
5.1 调试 .............................................................................................................................................. 18 5.2 结论 .............................................................................................................................................. 18
参考文献......................................................................................................................................... 19 附录 A ............................................................................................................................................. 20 附录 B ............................................................................................................................................. 25 致谢 ................................................................................................................ 错误！未定义书签。
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