有害气体检测与报警系统设计

毕业论文(设计) 毕业论文题目：有害气体检测与报警系统设计

学院：机械与电子工程学院

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学号：*******

指导老师：***

有害气体检测与报警系统

设计

摘要

本文设计了一种对环境中ＣＯ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8051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ＣＯ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。

【关键词】：可燃气体、报警器、单片机、数据采集与记录、浓度测量

Design and implementation of intelligent flammable gas leakage detection alarm system

Abstract

In this dissertation, an electric circuit is designed to collect and process the data of ＣＯdensity, 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 ＣＯdensity. As a result it can prevent fatal accidents. It designed with visual Basci and 8051 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.

[key words]:combustible gas; annunciator;data processing; microcontroller; density measurement; detection ; alarm; distance control

目录

1绪论 (6)

1.1本课题的研究背景与意义 (6)

1.1.1研究的背景 (6)

1.1.2研究的意义 (6)

1.2报警器的结构与安装 (7)

1.2.1报警器的构成与应用 (7)

1.2.2报警器的布点 (7)

1.2.3报警器的安装 (8)

1.3可燃性气体报警仪国内外发展情况 (9)

2系统的功能模块与硬件结构 (10)

2.1系统的功能模块 (10)

2.2系统的硬件结构 (11)

2.2.1主控机 (11)

2.2.2模拟信号的数据采集 (12)

2.2.3模拟信号的放大处理 (12)

2.2.4从机及A/D转换电路 (13)

2.2.5ADC 5G14433 与单片机的接口 (14)

2.2.6数码显示电路 (15)

2.2.7系统报警系统的组成与程序代码 (18)

2.2.8信号调理电路 (21)

3系统软件的总体设计 (22)

3.1系统流程设计 (22)

3.2数据库设计 (23)

3.2.1数据库系统设计 (23)

3.2.2系统的实现 (23)

4远程温度数据采集控制 (24)

5结论 (25)

致谢 (26)

参考文献 (27)