Research On Monitoring System Of Grain Storage Based On Web Technology

With the rapid development of network technology and embedded technology and their integration, Web technology has been extended to the development and applications of embedded systems. Monitoring system based on embedded Web technology has become the latest trend of network control at the scene of industry. Embedded Web technology meets scalability, distributed, real-time and other features of the modern monitoring system and has broad application prospects. According to the requirements of large Grain Storage and in conjunction with applications of embedded Web technology, this paper designs a monitoring system of Grain Storage based on Web technology.This system adopts distributed architecture, mainly composed of three parts: measuring and controlling devices of Grain Storage site, embedded Web server and remote monitoring console. Embedded Web server interacts with remote monitoring console upward through fiber Ethernet, and communicates with measuring and controlling devices of Grain Storage site down through CAN bus. Measuring and controlling devices implement the corresponding operation according to the order receiving from the remote user.Measuring and controlling device is composed of microcomputer AT89C51, temperature sensor, humidity sensor, the controlling circuit of Grain Storage equipments and so on. Then according to the actual needs of grain, make CAN communication protocol, design the main program for measuring and controlling devices, develop receiving interrupt procedure of CAN bus, make relative program to get temperature and humidity and control the state of Grain Storage equipment, and upload the acquisition through the CAN bus to the Web server.Web server works on the embedded platform, which is composed of SBC-2410X and embedded operating system arm-linux. According to the needs of grain, expand CAN interface using MCP2510 and TJC1050, and add MCP2510's driver to the arm-linux kernel in static compilation way. Then design embedded Boa server and develop Boa monitoring software based on this platform. The former includes the server options, Boa server configuration, compiler and port process. The latter contains the design of grain remote monitoring page, system security certification and CGI programs of Web server, which control the acquisition of temperature and humidity and the state of Grain Storage equipments. Web server calls CGI programs to deal with the application from user and communicate with measuring and controlling devices of Grain Storage site. Finally, this paper makes brief instruction about the storage content and form of the system historical data.Through this programme, terminal users from the remote monitoring computer can land the monitoring page of Grain Storage through Ethernet whenever possible, and observe the situation of grain storage site.