Development Of An Intelligent Greenhouse Environment Monitoring System Based On The Internet Of Things

With the rapid development of IoT and information sensing technology in recent years,and the development background of the strategy of rural revitalization,modern facility agriculture is catching a new wave of development.By the end of 2018,Greenhouses in china cover an area of1963700 hectares,that considered to be more than 80% of the world,ranking first in the world.Although the total output is high,but because of the low intelligence,inconvenient management and high cost,greenhouse yield per acre in China is only 1/8 of that of developed countries,and the overall production efficiency is low.Greenhouse monitoring systems abroad is relatively mature and highly automatic because of its early start,but the equipment system is huge and the direct cost is high,which is not suitable for the development of greenhouse planting industry in China.In recent years,many solutions have been put forward,but there are some problems such as low precision of environmental perception,insufficient communication distance,high power consumption and lack of intelligent control,which restrict the popularity of greenhouse.Based on the background of modern Internet of things technology and facility agriculture,the problems of the current intelligent greenhouse greenhouse environmental monitoring system are pointed out.Based on the deficiency,the monitoring system of greenhouse greenhouse is optimized.The design abandoned the traditional wireless communication technologies such as WIFI and GPRS,or the single WSN(Zig Bee)communication technology,which are widely used in the agricultural field..The field monitoring terminal and remote cloud monitoring platform are designed by integrating NB-IoT cellular network communication and Zig Bee near field communication technology.A complete set of greenhouse IOT system design is realized from the perception layer,network layer to platform layer and application layer.The main contents of this paper are as follows:(1)In terms of system communication,a new network technology of NBIo T and Zig Bee is proposed,which combines the ring buffer queue algorithm to construct low power wide area wireless network.Compared with traditional wifi,blue,Lora and other Internet of things technologies,the communication coverage is wider,power is lower,operation is more convenient,and has excellent robustness.(2)In terms of remote monitoring platform,the general c/s structure is abandoned and connected to the b/s cloud monitoring management platform.The design uses Ajax asynchronous request local refresh technology,and web can refresh the environment monitoring factors dynamically in real time.Users can view and manage data remotely at any time,set alarm threshold and other operations.It improves the practicability and comfort of the platform,reduces the operation threshold and the cost of later maintenance,and facilitates the use and promotion.(3)In the aspect of intelligent control,according to the actual change characteristics of greenhouse environment factors,fuzzy PID control algorithm is introduced.Through adjusting the equipment such as spray irrigation and temperature control,the closed-loop feedback control of the system is realized.Based on the optimum growth conditions of crops in the greenhouse,it is beneficial to the high-efficiency growth of crops.(4)In terms of power supply,the design of double power supply of solar energy and battery,the switching characteristics of triode and MOS tube are used to realize the solar power supply and charge the battery at the same time,and switch the seamless power supply with the battery when the solar power is cut off.The energy consumption is saved when the power supply of the system is stable.After the system design is completed,the prototype system test and the field deployment of Tongxin agricultural park in Ganning Town,Wanzhou District,Chongqing,have achieved excellent communication requirements under the conditions of multi node deployment,multi parameter detection,low power consumption and wide coverage communication,and meet the system requirements.The results show that the reliability of the modern Internet of things technology applied to the greenhouse environment monitoring system provides the application foundation for the data collection and remote communication of agricultural big data.The system deployment is optimized.The NB-IoT and Zig Bee are combined in modern agricultural communication to realize high stability,low power consumption and wide coverage communication mode,which overcomes some disadvantages of the current temperature shed environment monitoring system.The system can provide technical support and reference in the field of agricultural monitoring and other fields.