Design Of Low Power Agrometeorological Monitoring System Based On LoRa Wireless Networking Technology

Agricultural weather monitoring system is a system that can automatically monit or the weather environment elements,forward or upload the monitored weather enviro nment data to the cloud platform in real time,and issue early warning to users in time.At present,the number of meteorological equipment in China’s meteorological monit oring system is set too single,the power consumption of hardware and software in the system is relatively high,and the accuracy of the collected meteorological data and th e stability of the whole system for long-term use need to be improved.Therefore,acco rding to the current needs of the society and the current situation of domestic agricultu ral weather monitoring system,this paper proposes a low-power agricultural weather monitoring system based on LoRa wireless networking technology.The main work of this paper is as follows:(1)The software and hardware low-power design of the agricultural weather mon itoring system.Hardware completed the switch power consumption design,low-powe r microprocessor circuit monitoring,static power consumption design,to realize the ci rcuit PCB hardware low-power design.The software completed the low-power design of MAC layer used for RF state scheduling in wireless network protocol,and the desi gn of MCU hibernation wake-up switching mechanism;then combined with some me thods to reduce software power consumption such as compilation optimization level a nd instruction sequencing to realize the low-power design on the software.(2)Using STM32G0,an ultra-low-power microcontroller,as the main control chi p;Modbus-RTU protocol to collect data from weather sensors;LoRa wireless networ king communication technology to relay or forward weather data to achieve low-pow er long-distance reliable communication between each sub-meteorological station;we ather gateway using 4G or Wi Fi to connect equipment to the Internet and upload weat her data to the cloud platform The Flash is divided into A and B zones,and the Boot L oader is designed to realize IAP download and OTA network remote upgrade;finally,the MQTT protocol and Ali cloud are used to realize the weather monitoring cloud pla tform and mobile APP.(3)Solar charging panel,rechargeable lithium battery and external power supply are used to power the system.So that the sub-weather station can reasonably use solar energy resources when working in the field,and the lithium battery can continuously and steadily supply power to the sub-weather station under the harsh environment,so the whole weather monitoring system has the ability to resist natural disasters and ens ure the sub-weather station can operate independently in the outdoor for a long time.After system testing,the number of sub-meteorological stations in the meteorolo gical monitoring system designed in this paper is scalable,the accuracy of meteorolog ical environment data collected by each sub-meteorological station is good,and the sy stem can stably monitor meteorological elements such as atmospheric temperature an d humidity,wind and wind direction,rain and snow,light intensity and atmospheric pr essure.The average power consumption of the sub-meteorological stations is 1.58 W d uring normal operation,which meets the standard of less than or equal to 2W announc ed by the Meteorological Bureau of China for new weather stations.