Street Lamp Control Module Based On LoRa Sequence Spread Spectrum Wireless Technology

At present,the intelligent street lamp market continues to heat up,the state strongly encourages the Internet of Things industry,the traditional street lamp is quickly replaced by long-distance wireless control street lamp,so the development of wireless control street lamp products is of great significance.Street lamps based on FSK or GFSK wireless ZigBee network and NB-IOT have been put on the market,which have some disadvantages compared with LoRa sequence spread spectrum communication technology.The wireless module of LoRa sequence spread spectrum technology will be more suitable for street lamp application in the aspects of long-distance,anti-jamming,late charging and so on.It is worth popularizing.For the purpose of applying LoRa sequence spread spectrum technology to street lamp and realizing remote control of street lamp switch conveniently,this thesis describes the development process of a LoRa street lamp control module.In this thesis,the principle,basic concepts,LoRa communication technology parameters,the hardware reality of the module,device selection,software design,serial port configuration command and control communication protocol,as well as test and other aspects are discussed and analyzed in detail.In order to solve the application problem of LoRa technology in street lamp,a method of designing and fabricating a separate communication module based on chip and MCU technology,which is grafted into the basic lighting circuit of street lamp,realizes the application of wireless LoRa technology in street lamp.Specific implementation of the software part using IAR software development environment and C language to complete the basic function of the software programming and design.In the hardware part,Altium Designer software is used to design the PCB layout of the module and to make the hardware module for evaluation.The test method mainly focuses on the actual test,as much as possible from the module communication performance test,communication interference test,frequency offset test and serial command test and other aspects of a comprehensive test module.By explaining and comparing several parameters affecting the effect of LoRa sequence spread spectrum communication,this thesis illustrates how to select specific parameters.In this thesis,for the use of module devices,after consideration,as far as possible to choose the mainstream easy-to-buy devices for product processing and production.According to the reference design of the manufacturer of LoRa communication chip SX1278,the chip is applied to the actual module.The design modification and optimization of the schematic diagram are completed,and then the design and optimization of PCB are completed.The SX1278 chip is applied in real life.At the same time,the software of the module is designed reasonably,and a simple and practical protocol for communication is formulated.Through the attempt of making the hardware module,we can have a deeper understanding of LoRa technology.This graduation project is an exploration of the combination of LoRa communication technology and street lamp control technology.Finally,the application effect of LoRa wireless communication technology in turning on and off lights and brightness adjustment of street lighting equipment is realized.