Design And Implementation Of The Farmland Dynamic Monitoring System

Monitoring and collecting field information is an important part in precision agriculturemanagement，and has great significance to the growth and yields of crops. Contrary to modernagricultural technology trends, this paper summarized and analyzed the status quo ofinformation technology in the field information acquisition at home and abroad. Thenaccording to the deficiencies of the existing field information monitoring system andcombined with domestic actual conditions, a farmland dynamic monitoring system based onGPRS/GSM was designed. In addition, low-power was a goal in the design. System powerwas supplied by solar battery. However, the purpose of the present study was to realize avariety of field information’s collection, storage, transmission and analysis. The major fieldinformation consisted of: the farmland soil moisture, the picture of the growth seedlings, thecanopy temperature and the weather information. Thus, the system could provide a certaintheoretical data basis for agricultural production.This paper’s major contents and conclusions are as follows:(1) On the one hand, this paper described functions and workflow of the fieldinformation monitoring system, and then introduced the composition of field informationcollection terminal in detail based on C8051F040processor. On the other hand, GSM/GPRScommunication was selected as the system data transfer solution according to the actualneeds.(2) With system functions analyzed, a detailed description of field information collectionterminal design was explained, involving sensor design and selection, component selection,and hardware design. Here, hardware circuit design included control processing module,information collection module, wireless communication module, power supply module andcanopy temperature sensor circuit schematic design.(3) The software of collection terminal was designed using modular concept. The designprocess was introduced from farmland parameter acquisition to growth seedlings imageacquisition, wireless transmission and so on. Firstly, multi-sensor acquisition program wasprepared for timing acquisition of farmland parameters; Then growth seedlings imageacquisition procedure was designed to achieve real-time collection of JPEG images; Based onAT command, program was compiled to achieve the farmland information’s reading andtransmission through Internet and GPRS; Lastly, transmitted data communication protocol was designed to ensure the data transfer, between the collecting terminal and the monitoringcenter, was right.(4) VC++network programming was used to achieve monitoring center interface andfunction design. Through the MFC development tools, the field information system couldrealize real-time monitoring and data recepting functions by GSM/GPRS, incorporatingclasses, controls, OpenCV and API functions.(5) In this study, terminal collecting parameters was carried out in the absence of light.7A h battery in use efficiency of60%could be used14days after calculation. The resultssuggested that the system was low power consumption and solar batteries can meet the systemrequirements. On the other hand, the system can realize the wireless transmission function ofthe farmland parameters and image information. And transferring a320*240picture wasabout1-5min. These results can be explained by the GPRS communication speed and thenetwork quality. Although the transmission speed had basically reached the requirements, theamount of information transmission was not great.In a word, the hardware operation of the system was stable, accurate and reliable. Thesystem software was simple, practical and convenient. So we recommended that the systemcan meet user needs, make the farmland information monitoring more accurate, and be usedto guide production practices.