The Design Of Wireless Automatic Fire Alarm System

At present most of the use of automatic fire alarm system based on CAN bus, Because of its using wired communication way transmission, the cable is vulnerable to erosion and wear caused by the high failure rate, high rate of false positives which can lead to system failure. In order to avoid the problems of cable fire alarm system. Imagine building a wireless transmission mode of automatic fire alarm system, with the development of microelectronics and wireless communications technology in recent years, it can become a reality. In this paper, a construction of automatic fire alarm system based on RNF24L01 wireless communication technologyFirstly, The according to the characteristics of the built environment, in the analysis of the current mainstream wireless transmission applied in fire alarm system fit proposed to arm the STM32 microprocessor based on Cortex-M3 core architecture as the control core, a smoke detector and feeling temperature detector in combination with the composite type fire detector alarm data collection and nRF24L01 as transmission of the alarm data detection and wireless transmission system.Secondly, This paper gives the detailed hardware and software design of the whole system. In the aspect of hardware design, the hardware circuit of collecting, processing, displaying and transmitting the fire alarm data is designed. Software design, taking into account the application of embedded operating system in the wireless fire alarm system, the use of embedded operating system based on FreeRTOS platform for the development of wireless fire automatic alarm system. On the basis of analysis of the characteristics of, with the idea of modular design, based on nRF24L01 wireless communication process. The paper gives the software design scheme, and introduces in detail the software flow of each module, including system initialization module, the NRF initialization module, The fire area compound detector initialization configuration. At last, the hardware function and basic communication function test of the whole system are tested. The whole system is running normally, the data transmission is reliable, and the alarm function is running normally.