目录
摘要 ..................................................................................................................................................................0
Abstract ...........................................................................................................................................................1
1 绪论 ..............................................................................................................................................................3
1.1 课题的研究背景......................................................................................................................................3
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......................................................................................................................4
1.4 课题的研究内容 .......................................................................................................................................5
2 火灾报警器的总体方案设计......................................................................................................................6
2.1 系统的功能要求 .......................................................................................................................................6
2.2 系统的技术要求......................................................................................................................................6
2.3 系统的组成及方案设计..........................................................................................................................7
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
3.2.1 MQ-2 介绍 ................................................................................................................................................13
3.2.2 LM393 介绍 ..............................................................................................................................................15
3.3 数码管显示电路设计............................................................................................................................16
3.4 声光报警提示电路................................................................................................................................17
3.4.1 灯光提示电路...........................................................................................................................................17
3.4.2 声音报警电路...........................................................................................................................................17
3.5 温度检测电路........................................................................................................................................18
3.5.1 DS18B20 概述...........................................................................................................................................19
3.5.2 DS18B20 引脚介绍...................................................................................................................................20
3.5.3 DS18B20 的内部结构...............................................................................................................................21
3.5.4 DS18B20 的程序流程图...........................................................................................................................21
3.6 按键电路................................................................................................................................................22
4 系统的软件设计........................................................................................................................................23
4.1 软件介绍................................................................................................................................................23
4.2 系统程序流程图....................................................................................................................................26
5 火灾报警器的测试结果及结论.................................................................................................................27
5.1 调试 ........................................................................................................................................................27
5.2 结论 ........................................................................................................................................................27
致谢 ................................................................................................................................................................29
参考文献 ........................................................................................................................................................30
附录一:原理图 ............................................................................................................................................31
附录二:仿真图 ............................................................................................................................................32
附录三:实物图 ............................................................................................................................................33
附录四:源程序 ............................................................................................................................................34