Research And Design Of Greenhouse Monitoring System Based On Internet Of Things

China is a large agricultural country,and agricultural development is inseparable from social and economic development.In recent years,the Internet of things and sensing technology have been widely used.It is an inevitable trend to combine information technology with traditional industries.Therefore,facility agriculture represented by greenhouse has ushered in new development opportunities.The traditional extensive greenhouse agricultural production mode has been far from meeting the development needs of the times,Based on the research status of greenhouse monitoring system,this paper designs a greenhouse monitoring system based on Internet of things.The system mainly adopts ZigBee and Nb-IoT technology to realize the remote monitoring of the environmental data in the greenhouse and the control function of the actuator,so that the crops in the greenhouse can grow in a suitable environment.The main contents of the study are as follows:（1）Research on key technologies and overall scheme design of the system.According to the actual needs of greenhouse users for automatic control,the key technologies are studied and the overall scheme of the system is designed in combination with the Internet of things technology.（2）Hardware design of the system.According to the hardware structure of the system,the hardware circuits of ZigBee wireless sensor network,embedded gateway and actuator are designed respectively.（3）The system software design includes four parts: ZigBee wireless sensor network software design,embedded gateway software design,server receiver software design and monitoring platform software design.Firstly,the environmental data in the greenhouse is obtained through ZigBee wireless sensor network and converged to the embedded gateway.Then the embedded gateway is used to upload the environmental is realized through the greenhouse monitoring platform.At the same time,the embedded gateway can also send the received server-side control instructions to the system execution end to control the operation of the equipment.（4）Algorithm research: firstly,we use the Grubbs criterion to remove the outliers of the collected data,and then use the improved adaptive weighted fusion algorithm to study the fusion of multi node data in the greenhouse;In addition,the fuzzy control is used to design the fuzzy controller for the air temperature and soil humidity in the greenhouse,and the simulation is completed with the help of matlab fuzzy control box.（5）System setup and debugging.After the software and hardware design of the system is completed,the functions of ZigBee wireless sensor network,BC26 wireless transmission and greenhouse monitoring platform are debugged by building a model in the laboratory to simulate the internal environment of the greenhouse.