Design Of Environmental Monitoring System Based On LoRa

In the past 20 years,we have been surrounded by the Internet.The Internet has changed the way we live and work,and has driven the development of a series of industries.Around 2015,my country's mobile Internet technology began to develop rapidly.In the architecture of the mobile Internet,the top layer is our social network,such as We Chat,Weibo,and web pages.And these social networks are running in our smart devices,and operating systems such as common IOS,Android,and Windows are running in these smart devices.These mobile devices are networked through 2G,3G,4G and Wi Fi technologies.With the development of the Internet,the Internet of Things has been developed.Realize the interaction between people and things,things and things.Smart hardware has been widely used,such as smart bracelets and smart home appliances.With the development of the Internet of Things,more sensors and devices need to be connected to the network,and traditional mobile cellular networks cannot meet the needs of the industry.At this time,5G and LPWA low-power wide area network technologies have been developed.LoRa is a key technology applied in LPWA low-power wide area network technology.With the development of the Internet of Things technology,the technology of environmental monitoring is constantly improving,aiming at a series of problems of traditional monitoring system,such as complicated wiring,short communication distance,high power consumption and high cost.This paper designs a wireless environment monitoring system based on LoRa communication technology.It mainly collects temperature and humidity,smoke and fog,PM2.5 and light intensity in the environment.Aiming at the disadvantages of expensive LoRa WAN gateways and difficult development,a lower-cost Wi Fi is used.The module acts as a gateway,and finally uses the MQTT Internet of Things communication protocol to upload data to the Alibaba Cloud platform to realize the function of remote monitoring.The contents of this article are as follows:1.With reference to a large number of domestic and foreign documents,the research status at home and abroad is introduced,the advantages and disadvantages of different wireless transmission technologies are compared,the key technologies in the system are introduced,and the feasibility of the system scheme is discussed.2.In terms of hardware design,it mainly introduces the chip and circuit design used in the system.The system framework is determined,and the structure of the master and slave are analyzed.3.In terms of software,first introduced the development tools used in the system;secondly,introduced the design of the data structure of the LoRa receiving and sending data buffer;then according to the needs of the actual application scenario,refer to the Mod Bus protocol and modify it on the basis of the Mod Bus protocol.The proprietary communication protocol of this system is designed to make the data receiving and sending between the various networks become orderly.Finally,the software design of gateway and sensor driver is introduced.4.Finally,the LoRa data transceiver and cloud server communication were tested in the laboratory building and campus,and the test results can achieve the expected goals.The environmental monitoring system originally designed has the advantages of long communication distance,low power consumption and simple wiring.This system has a great development prospect in the future environmental monitoring market.