The Research Of Alarm And Control System For Electric Fire Prevention Based On Wireless Network

In recent years, the people’s living standard and the degree of production and living electrification continue to increase with the rapid development of national economy. Electric equipments have brought great convenience to people’s work and life, at the same time there are a lot of security risks. The fire hazard caused by electric equipments holds the first position in all of the reasons. Fire hazard has brought not only the damage of the electric equipments but also the injuries and deaths, which results in tremendous losses. Electrical fire control system monitors the electrical fire hazards in real-time. It can be achieved early warning on an electrical fire. The system which is applied in practice can effectively prevent electric fires and possible troubles.The background of the electric fire monitoring system has been made an deeply research. After a review of a large number of literature on electric fire alarm monitoring technology domestic and international, a design scheme of wireless networks electric fire monitoring system is proposed. Electric fire is effectively monitored through the system which combines the slave computer and the master computer through the wireless network.At the first part of the thesis, it makes a discussion on the necessity and basis of building the electric fire monitoring systems, then it make s some survey on the designing theory, and explicits the structures of the electric fire monitoring systems. In the second chapter, the detailed hardware circuit diagrams is designed, then the fire detector LDT9103 E is chosen as the signal acquisition module and the STC89C52 based on 51 microcontroller is chosen as the host system. Wireless chip NRF24L01 and chip STC11L04 E consist of wireless network module. Serial communication of the data transfers through the chip CP2102.By making use of the software keil, the programing design of the electric fire monitoring systems is finished on the basis of the hardware circuit diagram. The collection module acquires the leaking current signal of power lines. The main control system transfers the leaking current signal to the receiver via a wireless transmission module. The signal is transferred to the master computer through the chip CP2102. In this way, the slave computer can acquire and achieve transmission of information to the master computer.The software of master computer is designed by using the Lab VIEW software, and realized the display, store, and inquire function, with enabling the LABSQL the access to the access database. The serial communication is enabled communication between master computer and USB devices, by using the VISA widget of the LabVIEW software. What’s more, the system can filter the interference signal caused by some accidental factor.Electric fire monitoring system which is based on wireless netwo rk achieves fire alarm and the purpose of pre-alarm. The system has the advantages of strong feasibility, high reliability, low cost and timely precise alarming, and it can lessen the possibility of the electric fires. This research provides some technical support to develop and improve the fire alarm system based on wireless network. There is certain practical significance to accelerate the development pace of wireless fire alarm systems.