于基单片机的烟感报警器--本科毕业设计.doc_智慧烟感设计方案资源-CSDN文库

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摘要

本设计设计一个烟感报警器，通过传感器 (包括温感和烟感)将现场温度、烟雾

等信号转化为可检测的电信号，放大和滤波电路将传感器输出的电信号送入 A /D 转换

电路 ,完成烟雾传感器和温度传感器输出的模拟信号到数字信号的转换，单片机判断现

场是否发生火灾。若发生火灾，系统会驱动蜂鸣器和指示灯报警。

由于系统采用高性能的单片机芯片为核心和高灵敏度的烟感传感器，而且利用

声音和指示灯两种报警形式进行报警提示，大大的提好了系统的精确性和可靠性。

关键词单片机 AT89C51 ADC0809 传感器

Summary

The design of the design of a smoke alarm, the scene temperature, smoke, etc.

signal into electrical signal detected by the sensors (including temperature

sensitive and smoke), amplification and filtering circuit of the sensor output

electrical signal fed to the A / D converter circuit, the completion of the smoke

sensor and temperature sensor output analog signal to digital signal conversion,

the microcontroller to determine whether the site fire. If a fire occurs, the

system will drive the buzzer and the alarm indicator.

As the system uses high-performance microcontroller chip as the core and high

sensitivity smoke sensors, and the use of sound and light form of two alarm alarm,

much of the good accuracy and reliability of the system.

Keywords AT89C51 MCU; ADC0809 sensor

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目录

1 引言..............................................................3

1.1 课题研究的背景和意义...............................................3

1.2 本文内容的结构安排 .................................................3

2 火灾报警系统整体方案设计..........................................4

2.1 火灾的烟雾产生过程和温度升高过程 ...................................4

2.2.1 系统硬件总体构架 .............................................5

2.2.2 系统软件总体构架 .............................................6

2.3 系统主要器件的选择 .................................................6

2.3.1 传感器的选择 .................................................6

2.3.2 单片机芯片的选择 ............................................11

2.3.3A/D 转换芯片的选择............................................12

3 火灾自动报警系统硬件设计.........................................13

3.1 信号放大和滤波电路................................................13

3.2 晶振电路与复位电路 ................................................15

3.2.1 晶振电路.....................................................15

3.2.2 复位电路 ....................................................15

3.3 声光报警电路 ......................................................16

3.3.1 声音报警器...................................................16

3.3.2 光报警器.....................................................17

3.4 数据采集电路......................................................17

4 火灾报警系统程序设计.............................................20

4.1 软件开发环境 ......................................................20

4.2 火灾报警系统程序设计 ..............................................20

4.2.1 据采集程序 ..................................................21

4.2.2 火灾判断与报警程序...........................................22

4.3 软件调试 ..........................................................24

5 总结.............................................................24

参考文献...........................................................25

附录...............................................................26

致谢...............................................................27

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