气体检测与报警系统的设计

2.1 气体传感器....................................................................................................................6 2.2 温度传感器....................................................................................................................8 3 系统的功能模块与硬件结构.................................................................................................9 3.1 系统的功能模块............................................................................................................ 9 3.2 系统硬件结构.............................................................................................................. 10 3.3 检测系统硬件电路主控芯片选型............................................................................10 3.4 MCF52259 的硬件最小系统...................................................................................... 11
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3.9 液晶显示屏电路的设计................................................................错误！未定义书签。 3.10 本章小结.......................................................................................错误！未定义书签。 4 系统软件总体设计............................................................................................................... 17 4. 1 系统流程设计............................................................................... 错误！未定义书签。 4.2 数据库设计.....................................................................................错误！未定义书签。 总 结...........................................................................................................................................19 致 谢...........................................................................................................................................20 参考文献.....................................................................................................................................21
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气体检测与报警系统的设计
摘要
本文设计了一种对环境中气体浓度进行实时数据采集和处理，并能在浓度超标时 报警的电路。该电路通过单片机实现其控制功能。整个报警电路由四大部分组成：采 集模块、放大模块、模数转换模块、单片机。报警器的主要工作流程为：用两类传感 器（气体传感器和温度传感器）将所需的模拟信号采集放大后传送给 A/D 转换器， 再经模数转换后给将数字信号传送至单片机，然后通过单片机内部的数据处理，判断 是否需要启动蜂鸣器进行报警，预防恶性事故发生。该系统详细介绍了系统实现的硬 件、软件、数据库设计以及远程控制结构。该报警器广泛应用于居民家庭和企事业单 位，从而大大降低由有害气体所引起的中毒、火灾、爆炸等事故的发生率，保障了人 们的生命和财产安全，具有重要的实用价值。
1.3 可燃性气体报警仪国内外发展情况..........................................................................4 2 传感器的选择.....................................................................Fra Baidu bibliotek....................................................6
key words:combustible gas; annunciator;microcontroller; density measurement; distance control
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目录
摘 要............................................................................................................................................. I Abstract.......................................................................................................................................II 1 绪论...........................................................................................................................................1
1.1 本课题的研究背景与意义.......................................................................................... 1 1.1.1 研究的背景......................................................................................................... 1 1.1.2 研究的意义......................................................................................................... 1
3.4.1 电源电路的设计.............................................................................................11 3.4.2 晶振电路和 PLL 滤波的设计.......................................................................11 3.4.3 复位电路的设计.............................................................................................12 3.4.4 写入器接口电路................................................................错误！未定义书签。 3.5 信号调理模块电路的设计........................................................... 错误！未定义书签。 3.6 报警器电路.....................................................................................错误！未定义书签。 3.7 保护电路.........................................................................................错误！未定义书签。 3.8 通信模块电路................................................................................ 错误！未定义书签。
关键词：可燃气体；报警器；单片机；数据采集与记录；浓度测量
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The design of the gas detection and alarm system
Abstract
In this dissertation, an electric circuit is designed to collect and process the data of density, and the alarm is sent out when the density beyond the critical value. The control function of the electric circuit is complished by a microcontroller. The whole electric circuit of alarm is composed by four parts: data acquisition module, data enlarge module, A/D module and microcontroller. The technological process of the alarm is as follows: The analogue signals are collected by two kinds of transducers, and then the signals are transmitted to the ADC after enlargement. The data signals are transmitted by ADC to the 8051 microcontroller. The judgment of the buzzer alarm is made after the fata processed by 8051. Main work in this dissertation is :completing the choice of the machines, the design of the connection and the development of the procedure for data processing, realizing the autom atically monitor density. As a result it can prevent fatal accidents. It designed with visual Basci and microcontroller ,and the design of hardware , software, data base and distance controll of this system are put forward. The annunciator can be widely used in fam ilies and companies. The occurrence rates of the accidents such as poisoning fire, burst, etc are deeply reduced. Tt has an important and pratical value.
1.2 报警器的结构与安装...................................................................................................2 1.2.1 报警器的构成与应用......................................................................................... 2 1.2.2 报警器的布点...................................................................................................... 2 1.2.3 报警器的安装...................................................................................................... 2