摘要现代社会，各种高楼大厦随处可见，人们的生活越来越离不开各种电子产品。然而在林立的大楼和给人们带来方便的电子产品中，也存在着许多安全问题。一旦发生火灾，人们很容易遭受巨大的人身和财产损失。家用火灾报警系统能及时预防火灾的发生，并且在火灾发生的第一时间向指定手机发送火灾报警信号，提醒用户火灾的发生并及时做好应对措施，将火灾对人造成的伤害降到最低。39203
本系统使用STC89C52单片机，外接A/D转换，具有运算速度快、不易受外界环境影响的特点。论文中，选用的MQ-2烟雾传感器能够实现对烟雾信号的检测,通过A/D转换器将MQ-2输出的模拟信号转换成单片机能够识别的数字信号；DS18B20将检测到的温度信号直接传递给单片机。这两种传感器都能快速检测到信号的变化，并且价格便宜，使用寿命长，适合于家庭使用。当发生火灾时，可以实现声音报警、灯光报警或者选择手动报警。当发生错误报警时，用户可以手动复位按钮，停止错误报警，同时增加了报警模式选择开关，用户也可以选择当两个传感器都动作时再发出报警，这样就可以减少误报警发生的情况。考虑到当用户不在家时，家中可能发生火灾的情况，在本系统中还加入了SIM卡信息传递模块，在火灾报警器检测到火灾发生时，发出警报的同时以短信通知的形式发送火灾警报到绑定的手机上，这样当出现家庭成员不在家的情况时也能及时得到火灾消息，尽快作出反应，把财产损失降到最低。
毕业论文关键词： 传感器  单片机  火灾报警  SIM卡
Abstract In modern cities, there are a lot of tall buildings. People's lives become increasingly dependent on a variety of electronic products. However, there are many security issues.If a fire occurs, it is easy for people to suffer great personal and property damage. Home fire alarm system can prevent the occurrence of fire in time. It can send text messages to designated mobile phone in case of fire. It can remind the user to take actions to the fire. It will make the damage to a minimum.
Microcontroller STC89C52 and A/D are used in this system. It has a computing speed, less susceptible to external environmental impact features. In the paper, the selection of MQ-2 smoke sensor enables detection of smoke signals. It converts an analog signal into a digital signal by A/D. Digital signals can be recognized by SCM.  DS18B20 can send the temperature signal which it has recognize to MCU. Both sensors can quickly detect the change in the signal. They are cheap and can be use a long time. This fire alarm system is suitable for home. When a fire occurs, it can achieve sound alarm, light alarm or select Manual alarm. When an error alarm occurs, the user can manually reset button, stop false alarms. At the same time, it increases the alarm mode selector switch. Users can then select an alarm when both sensors action. This can reduce the occurrence of false alarms case. Considering that when the user is not at home, there might also be a fire, the SIM is joined in this system. When the fire alarm detects a fire , the system alerts and send message to a mobile phone. So that when family members are not at home, they can also receive timely news . They can react as quickly as possible and make property losses to a minimum.
Keywords:  Sensors  MCU  Fire alarm  SIM
目  录
摘  要    I
Abstract    II
1  概述    1
1.1  行业背景和研究意义    1
1.2  国内外研究现状    2
1.3  论文的主要工作    3
2  系统的硬件设计    5
2.1  系统整体设计    5
2.2  单片机最小系统    6 STC89C52单片机的家用火灾报警系统设计+电路图:http://www.youerw.com/zidonghua/lunwen_39469.html