Based On The Embedded Web Server Granary Temperature And Humidity Wireless Monitoring System

Scientific storage of grain is a very important step of producing grain. If administration of granary is improper, grain mildew or insect pest can bring a huge waste. The key problem of administration of granary is monitoring the temperature and humidity in grain stack. Because the inspecting equipments are expensive and the management methods are not advanced, the government expends largely on storage of grain every year.With the development of wireless communication, microelectronics, embedded and sensor technology, It becomes possible to design the lower price and advanced measure method of granary temperature and humidity.A kind of granary temperature and humidity measure system based on Embedded Web Server and combined with wireless, embedded and network technology is designed in this paper. The system is centered on Embedded Web Server and data collection terminals consist of some wireless digital temperature and humidity sensor modules. Wireless sensor modules transmit temperature and humidity data of node to Embedded Server by Wireless. Users access Embedded Server by Internet browser to get locale and history data expediently. Administrators can add or delete accounts and modify or set information of granary and parameters of Embedded Server.This paper particularly introduces and analyzes the design theory and method of software and hardware in embedded wireless granary temperature and humidity measure system. Wireless sensor modules adopt RF chip nRF9E5 and digital temperature and humidity sensors SHT11. Hardware of Embedded Server adopts ARM7 MPU and Ethernet Controller RTL8019AS to complete functions of Embedded Server, and USB to connect U disk to store and backup large collection data constantly. In software, Embedded operating system is UC/OS-II, it is transplanted to ARM7. The Web Server is based on LWIP protocol stack, uses CGI to realize dynamic web page and accesses Fat32 file system by USB.