| After entering the 21 st century,with the continuous development of information technology and sensor technology,the application of the internet of things is born.agricultural Internet of things technology is an important application category of Internet of things technology in the field of agricultural production.In China,the agricultural Internet of things is also supported by national policies and promoted to the level of national strategic development.Therefore,the agricultural internet of things open the road of modern agricultural development.On the basis of understanding the current situation and future development trend of Internet of things at home and abroad.the design and realization of intelligent greenhouse control system based on agricultural tnternet of things technology and remote computer technology.the system is mainly composed of microcontroller module,data acquisition module,wireless communication module and upper computer management platform module.at the same time,compared with wired transmission,wireless transmission technology has the unique advantages of high speed,convenience and low cost,which effectively avoids the tedious wiring on site.The main contributions of this paper are as follows:(1)According to the characteristics of greenhouse environment,demand has carried on the overall design,the function of the system of Internet of things technology three layer architecture is analyzed and the related theoretical knowledge learning,to the overall architecture design of system hardware,adopting modular thought,the environment parameter acquisition module,wireless transmission and control execution equipment,such as modular design.Nb-iot technology is adopted to build the long-distance wireless transmission path,which improves the reliability of data and instructions in the transmission process with the characteristics of strong connection and high coverage.compared with traditional technologies,the cost is lower.(2)Based on the keil uVision5.0 system development environment,transplant FreeRTOS embedded operating system,using C language development of terminal control software,embedded software overall functional requirements is the system software architecture modules associated design drawing,and according to the associated graph design corresponding module program,finally complete the docking between the various modules,to achieve its function.The terminal management platform uses the test platform of China telecom Internet of things,profile related services are deployed in JSON language,and develops online codec plug-ins to build a complete set of cloud platform system of Internet of things,Environment parameter data storage,query,control and other functions.(3)Software and hardware system design is completed,The function of each module is debugged by software and hardware respectively,debugging success,a makeshift to simulate the greenhouse environment,carries on the experiment,air temperature and humidity measurement error range within ±0.3 ℃,± 3% RH,soil temperature and humidity measurement error range within ± 0.5 ℃,±3% RH,through the experiment,the measurement results and the standard for sensor measurement results are analyzed,the system acquisition value within the permitted error in each of the sensor,the Internet of things cloud platform background data run successfully,the design of the system through test,the basic implementation function index. |
