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1、Research on Application of Intelligent Fire Alarm System in Abstract： This paper introduces the automatic fire alarm system using sensor， and describes the composition of hardware system and the principle of automatic fire alarm controller， introduces the application of C8051 microcontroller， sensor
2、 and signal conditioning circuit， sound and light alarm control circuit， stepping motor drive control circuit， network interface circuit and power circuit； finally， software of automatic fire alarm system is given， the software includes two parts of the embedded program running on the microcontrolle
3、r and running in the host computers serial communication program. After debugging， fire localization accuracy and false alarm rate are up to the requirements of warehouse management. 下载论文网Keywords： Automatic fire alarm system； MCU； UV sensor； infrared sensor0 IntroductionsAutomatic fire alarm system
4、 is control system with alarm and fire. In order to discover the hidden danger of fire and put out the fire， fire protection， power system places a variety of commercial and industrial buildings and modern intelligent buildings has the automatic fire alarm system. With the development of economy in
5、China， many modern buildings put forward higher demand for fire alarm and automatic fire extinguishing system. Large hotels， hotels， shopping malls， libraries， museums， archives and office buildings， automatic fire extinguishing system has become an essential safety device.Set the function to improv
6、e fire safety， to protect peoples lives and property safety， it is very important 1. Fire alarm system for fire detection and give warning sound signal， the cloth on the site of the detector， transmission lines and placed in the control room. Various physical parameters of field detector feel substa
7、nce when burning， the judgment result or analog values through the field bus back to the controller， controller for further processing after the alarm signal is given， the running state information is also obtained from monitoring module of fire fighting equipment.1 The hardware composition and cont
8、rol principle of intelligent fire alarm system1.1 The overall block diagram of the system hardwareThe electrical part of this system is mainly composed of detection unit， the central control unit， motor driving unit and communication module is composed of four parts. The overall block diagram is as
9、shown in Figure 1.The detection unit is mainly composed of fire detection sensor. In order to improve the system reliability， reduce false positives and false negatives， this system uses two kinds of different sensors， can also signal a fire according to the situation. The central control unit takes
10、 C5l microcontroller as the core， receiving and processing for fire alarm signal， the output alarm signal， driving motor signal， providing regional water supply solenoid valve action signal.Motor drive unit for a motor drive circuit， the SCM sends out control signal to control the motor rotating pos
11、itioning.Communication module makes the system with remote control and self checking function， the receiving module receives the remote control signal to judge signal to realize the corresponding self-test function.1.2 The design of detector in the system1） Ultraviolet detection. This system is used
12、 in flame UV sensor / flame sensor （ Hamamatsu R2868）， that made by Japanese production， called the fire finder. Produce instant can accurately found on Mars， and high transmission corona phenomena of non visible light can be completely removed. HamamatsuR2868 is the use of ultraviolet TRON to find
13、Mars source through the photoelectric effect and the metal gas multiplication effect， it has a very small volume and wide angle sensitive （directivity）， and can quickly and accurately find the weak ultraviolet light is emitted from the flame （capable of detecting SM or find a cigarette spot size at
14、a distance of the flame.）. It looks as shown in figure 2.Sensor signal conditioning circuit of Hamamatsu R2868 UV flame is as shown in figure 4.2） Infrared sensor. In nature， any more than the absolute temperature （273 degrees） when the objects will have infrared spectra， objects at different temper
15、atures， the wavelength of the infrared energy release is not the same， so the infrared wavelength and temperature is related to the. This system uses the unit of pyroelectric infrared sensor， the working wavelength of 4.35-0.15 to 4.35+0.15um it. Infrared sensor input amplifier circuit is through th
16、e two stage low pass filter circuit， as shown in figure 5.3） Signal isolation circuit. All signal of microcomputer output through TLP521-4 to control three motors. When the output of MCU control pin is low， the light emitting diode conduction light-emitting， so that the three level pipe， the drive control signal is low. When the MCU control pin outputs high level， the light emitting diode cutoff， three tu
