Development Of Wireless Fire Alarm System

With the rapid development of modern society, the hidden danger of the fire has been greatly increased. The market is becoming more and higher to the requirement of the fire alarm system. Traditional wired alarm system exist some disadvantages, such as misinformation, construction difficulty, high cost, poor flexibility, poor security and poor stability and relatively. A flexible, secure wireless communication mode to transmit alarm signals can overcome the defect of cable for fire detection and alarm system. The purpose of this paper is to research a kind of small intelligent wireless fire alarm control system.This wireless fire alarm control system includes fire detector part and alarm controller part. The main work done in this article is to design the controller hardware and the software system. The system was designed with STC12LEC5A60S2 microcomputer as the core controller. In this article, the controller human-computer interaction part of the hardware circuit includes power supply circuit, system clock circuit, wireless communication circuit, LCD display circuit, buzzer control circuit and keyboard circuit; Detector part includes wireless communication module circuit, control circuit power supply circuit and a buzzer. Software design with C language, it’s a structured design method with the strong processing capacity, and its operation speed is fast, and it also has good compatibility. In detector part, the design adopts the most widely used temperature detecting method, using DS18B20 digital temperature sensor to acquire the temperature data of the detection area. The main function of wireless communication part is to transmit the fire detection information between the detector and controller part. In this paper by comparing the characteristics of the existing several kinds of wireless transmission technology, such as the power consumption, transmit distance and application fields, then chose ISM radio frequency communication technology as the wireless communication technology. It has some advantages, such as small power and its transceiver can be adjμsted. Finally the system realizes the alarm information and fault information sending and receiving, alarm and display, store and query functions.The wireless alarm system in this paper have characteristics of intelligent fire alarm controller, small volume, data transmit using wireless technology, alarm in time accurately, install and debug simply and it cost lower. It can be used in house hold fire alarm control, mobile transport vehicles and temporary venues.