Design Of Irrigation Information Monitoring System Based On Wireless Sensor Network

As a traditional agricultural country,the technology related to the Internet of things in agriculture has made a historic development in recent years,which is an important means to promote the transformation of agriculture in our country.The existing irrigation environmental information monitoring has the characteristics of long monitoring time,wide monitoring area,severe and complex environmental factors and so on.And at present,most of the irrigation information monitoring facilities applied in the market have some problems,such as low timeliness of collection,single data,unstable system and so on,which can not meet the needs of existing irrigation environment information monitoring.In view of the above characteristics of irrigation environment monitoring,combined with the research results of agricultural Internet of things at home and abroad,this paper carried out the design of irrigation information monitoring system based on wireless sensor network.The main work of this paper is as follows:First of all,the development status of farmland irrigation information monitoring system at home and abroad is analyzed and summarized,and the disadvantages of the development of agricultural irrigation technology in China are obtained.then,according to the shortcomings of the current situation of agricultural irrigation in China,the design technical route and main research contents of this paper are put forward.Through the research on the key technologies such as the agricultural Internet of things and the feasibility analysis and design requirements of the system,the overall design scheme of the irrigation information monitoring system is made clear,and the deployment scheme of the terminal node is determined by analyzing the network coverage of the irrigation area.the cloud platform scheme of the Internet of things is planned and designed according to the overall design scheme of the system.In the hardware design of irrigation information monitoring system,the overall design scheme of the hardware system is put forward,and the framework of sensor module and actuator module is designed according to the overall design scheme.the core module of the system uses SIM7020 C chip as NB-IOT wireless communication module and Arduinomega2560 as the system microcontroller.The design of each node is based on the actual application environment,and the node is selected according to the system design requirements and application environment,and then the circuit is connected with the microcontroller through the serial port connection diagram of each node.each module integration mainly includes terminal acquisition node design,power module design,wireless communication module circuit design,executive node selection design.Irrigation information monitoring system software design,the overall software design process mainly includes actuator node software design,collection node software design and cloud platform access program design.First of all,the system communication protocol is designed,and then the data acquisition program and data transmission and upload program of each node are designed,and then the actuator node polling data program and receiving instruction program are designed.The development of the access process of the cloud platform of the Internet of things is the main part of the software design.The system is mainly developed and designed based on the MQTT public protocol.Firstly,the interaction between the terminal device and the cloud platform is designed,and the data interaction and application display interface design between the device and the platform are completed according to the development process on the platform side.The system function is tested through the configuration AT instruction of the SIM7020 C module to ensure the stable operation of the system.The irrigation information monitoring system test was carried out in the agricultural college proving ground of Shihezi University.Firstly,the hardware debugging of each module and the One NET cloud platform test were carried out.According to the change curve of the environmental data displayed by the platform,we can see that the test effect of the platform is good,and each module is running normally,which can truly reflect the impact of weather changes on the irrigation environment.Then test the data transmission success rate of the remote acquisition terminal in different environments to verify the stability and reliability of the system.The test results show that the average success rate of system communication is 92.7%.Through the accuracy of the system data collection information and the start-stop test of the valve controller,the system can accurately and timely display the soil moisture,air temperature and humidity,light intensity and other information of the irrigation environment,in which,the average relative error of soil moisture is-1.08%,the average relative error of air temperature is 0.39%,and the average relative error of light intensity is 0.99%.The valve actuator can perform the corresponding operation well under both manual control and automatic control,which meets the requirements of system design.