Design Of Atmospheric Environment Monitoring System Based On LoRa

In recent decades,China's economic development has attracted worldwide attention.The continuous development of science and technology,the speed of industrialization has been accelerating,and the emissions of various polluting gases have also increased sharply.This has made the atmospheric environment pollution more and more serious,and the types of pollutants.It has also become diverse.Traditional atmospheric environment monitoring systems h ave a wide range of problems,such as single detection gas,low system measurement accuracy,and inability to collect data for a long time.For areas with a wider monitoring range,it is a difficult problem to achieve a longer monitoring area based on low power consumption.Therefore,increasing the communication distance,reducing the power consumption,improving the reliability and real-time performance of the monitoring data,and increasing the anti-interference ability are the problems faced in the research of atmospheric environment monitoring systems.The environmental monitoring system based on LoRa?Long Range?designed in this thesis applies remote spread spectrum modulation wireless transmission technology to atmospheric environment monitoring.T he system is mainly divided into three parts:terminal collection node,gateway and remote monitoring center.The LoRa wireless transmission technology is used without GPRS communication to upload the environmental parameters collected by the terminal collection node to the monitoring center.The design of the system mainly includes hardware,software and networking.The hardware includes the circuit design of the terminal acquisition node and the gateway.The terminal acquisition node selects the low-power STM32F103 chip for node circuit design.The gateway circuit selects the ARM9-based S3C2440 microprocessor Can increase the scalability and portability of the system,transplant the embedded operating system Linux to the gateway.In terms of software,the network design is carried out according to the LoRa communication protocol,and the star network is used for networking to realize the communication of multiple collection nodes and gateways.In order to facilitate the storage and display of the collected environmental information,a web server is designed to display the collected NO₂,SO₂,O₃,CO,PM2.5,PM10,temperature and humidity in the interface in real time.After completing the construction of the entire system,the communication distance,node power consumption,sensor accuracy,and system functions of the system were selected to complete the relevant tests.The expected results were achieved,which verified that the system can run stably for a long time and achieve multi-parameter acquisition.Long-distance transmission,with high accuracy,real-time and wide applicability.Finally,this paper carried out a detailed test of the module communication distance,module node power consumption,system function and data accuracy.Accuracy,real-time,and wide applicability.