Construction Of Greenhouse Control System Based On LoRa Wireless Sensor Network

At present,greenhouse control systems have appeared with the rapid development of intelligent greenhouse agriculture.Many researches had been advised to remote this kinds of management and control systems.However,these systems couldn't meet some requirements of environmental parameters indifferent growth stages,which may effect the yields and quality of crops.Then,an intelligent greenhouse control system which can realize real-time collection of environmental parameters and remote control irrigation for manual managed strawberry cultivation was designed to make up for some disadvantage of these system.This thesis was arranged as following,the summary development status and future trend of intelligent agriculture was introduced based on background and significance of the research,and then three-layers of greenhouse control system and some key technologies were build.The three-layers were designed,which were perception layer,network layer and application layer.Perception layer-LoRa wireless sensor network was constructed based on the STM32 microcontroller which can collect environmental parameters in real-time by sensors and can remote control irrigation through relay.Compared to several network communication technologries,the network layer selected GPRS and LoRa wireless sensor network to realize interaction of information between perception layer and application layer.The application layer designed some control irrigation strategy by using fuzzy theory.This layer send decision information obtained from data processing center as well as the fuzzy control gived decision analysis to STM32 control the executing device.The greenhouses control system based on LoRa wireless sensor network was tested to analysis the communication distance of LoRa and data packet loss rate.The test results showed that the more distance,the smaller communication success reate and the larger data packet loss rate.During the experiment,the communication distance is within 2km,and the result proved that LoRa communication could meet the system requirements.In addition,the hardware and software and overall function were tested in the laboratory.the system can achieve environmental data collection and remote intelligent irrigation.If the system were applied for the irrigation system,it might save more water and convenient for farmers to manage than some traditional irrigation systems.