关键词：可燃气体；报警器；单片机；数据采集与记录；浓度测量
I
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
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
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..........................................................................................................................6
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
key words:combustible gas; annunciator;microcontroller; density measurement; distance control
II
目录
摘 要............................................................................................................................................. I Abstract.......................................................................................................................................II 1 绪论...........................................................................................................................................1
I
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