LoRa Technology And Its Application In Intelligent Street Lamps

With the rapid development of social economy and the acceleration of urbanization,smart city has been gradually included in the national urban construction planning.In the process of smart city construction,street lights,as the urban road lighting infrastructure,are an important part of the smart city construction,which is closely related to people’s lives.Therefore,it is of great significance to carry out efficient and intelligent control and management.According to the requirements of intelligent street lamp system,this paper finds that PLC,WiFi,ZigBee and other Internet of things communication technologies have problems of short communication distance,high power consumption and high cost in street lamp control through comparison.LoRa technology with low power consumption,long distance and strong anti-interference ability is selected to design and realize the intelligent street lamp system based on LoRa.To this end,a series of studies were conducted as follows:According to the requirements and design objectives of LoRa based intelligent street lamp system,in terms of networking,the power consumption of nodes is reduced by analyzing the factors affecting the energy consumption of wireless sensor network nodes,using periodic monitoring and dormancy,and LoRa’s CAD channel detection mode.This paper proposes a centralized polling TDMA protocol,which uses uplink frequency and downlink frequency to separate,so as to avoid the problem of crosstalk between nodes and further optimize the transmission performance of the network.The intelligent street lamp system based on LoRa is designed and implemented.The system is divided into LoRa street lamp controller,LoRa street lamp gateway,intelligent street lamp control platform and mobile terminal software.Among them,LoRa street lamp controller and LoRa street lamp gateway communicate with LoRa to realize control and state information collection of street lamps.LoRa street lamp gateway and intelligent street lamp control platform communicate through GPRS to realize functions such as data forwarding and local control.The intelligent street lamp control platform and mobile terminal software are used to realize the management and control of smart street lamps.Finally,the system is tested and analyzed,and the test results show that the system achieves the expected goals in hardware characteristics,power consumption,communication distance and function,and has a good application prospect.