start
ATmega16 Initialize
N whether there are smoke signals?
Y
R0=1
collection temperature signal
whether the N
alarm value?
Y R1=1
dial-up alarm
READY=1?
Y
Figure 5. The main program flow chart
Because in the early stages of fires and the smoldering phase will produce a large number of aerosol particles and smoke particles .In the stage of incipient fire substances
in the combustion process produces a lot of heat, so should make the smoke sensor and temperature sensor used in conjunction, first with the smoke sensor detects whether there is smoke generation, then the temperature sensor detects the temperature, temperature sensor alarm value is set to 50 degrees. When the smoke is detected R0 is 1, not smoke R0 is 0. Then test the temperature when the temperature reaches the value of seasonal early warning R1 is 1, the value of seasonal temperature not to reach an early warning R1 to 0, at this time compared to the R0 and R1 is equal to the main chip when the dial-up alarm, if not equal is not to alarm re-tested. This smoke sensor and temperature sensor used in conjunction with greatly improved the reliability of detection to prevent the omission of false positives, program flow diagram shown in Figure 5.
V. CONCLUSION
By the cooperation of using of temperature and smoke sensors, through detecting the temperature and smoke on-site, the automatic alarm system could find any fire in warehouse and send the message to managers of warehouse in the early time by the form of short messages. So its application could greatly reduce fire losses and enhanced the safe reliability of warehouse more than the former single equipment of fire alarm, and prevent failing of reporting and misinformation. The system has a high reliability, low price and high sensitivity. REFERENCES
[1] Shunning Miao,Guangming Xiong,Yongping Li etc.Automatic Fire Alarm System Design and Research, Equipment Manufacturing Technology, 2006(2), P909. [2] Liang Ge, Qi Cong. Intelligent Analysis of office building fire. [3] Ti Zhou. Building Fire System Design, Yunnan Construction,2008(6).
[4] Honeywell (Honeywel1)'s construction equipment Monitoring System, Intelligent Building and City Information, 2008(4).
[5] Derek Clements-Croome, Intelligent buildings: design, management and operation, Thomas Telford Publishing, 2004.
[6]Zhang Huazhong, Commanding System of Fire Automatic Alarm and Fire Control Linkage based on Internet, Computer Engineering, 2001.
[7] ANSI, Radiant Energy-Sensing Fire Detectors for Automatic Fire Alarm Signaling, US: ANSI/FMRC FM3260-2004.