1、毕业设计（论文）报告用纸 第 1 页 共 51 页 摘 要 火灾作为危害人类生存的大敌,越来越受到人们的重视。随着高层建筑的不断增多, 火灾隐患增加。一旦发生火灾,将对人的生命财产造成极大的危害,会给国家造成极大的 经济损失,给社会带来重大影响。所以，如何较快的检测到火灾越来越受到人们的重视， 各个国家在这方面都投入的巨大的人力和物力，各种各样的火灾检测及报警系统便应运 而生了。 本系统根据火灾发生时的特征即烟和热，利用 QM-N5 传感器检测烟雾，利用 DS18B20 检测温度，当检测到烟雾或温度较高时，通过单片机处理实现报警，并通过 MAX485 实现与上位机通信，实现上位机对下位机的分布
2、式监控。 本系统下位机有信号采集模块，报警模块，串口通信模块组成，上位机通过 VB 界 面对下位机进行监控。整个系统效果还是比较好的，反应也较快，测量结果比较准确， 有一定的实用性和应用前景。 关键词：传感器;MAX485;上位机;下位机；分布式 毕业设计（论文）报告用纸 第 2 页 共 51 页 Abstract As the great enemy of mankinds survival,the fire are getting more and more attention With the continuous increase in high-rise building, the
3、hidden trouble of fire increased. Once a fire happened ,there will be a great harm to peoples lives and property ,it will cause great economic losses and a major impact on the community.So,how to konw quikely when the fire happens are receiving more and more peoples attention,and every country are p
4、utting more and more people and money on this aspect.So,a wide rang of fire detection and alarm system came into being. According to the characteristics of a happenning fire ,namely the heat and smoke,the system in this paper make use of QM-N5 smoke detection sensors to detect the smoke,make use of DS18B20 to test the heat,when the system find the smoke or high temperature,handling by the SCM,the system will give an alarm.The system communicate with the PC through MAX485,so that the PC ca
