Design And Implementation Of Wireless LED Screen Information Publishing System Based On Embedded Platform

Recently, with the rapid development of embedded systems, more and more embedded devices are used in fields of industrial control. Accompanied by further popularization of wireless communication technologies, it gradually become a trend of relevant applications.The cost of data transmission that is dependent on the wireless network and based on embedded system is getting lower and lower, and the communications is getting more reliable, base on this, we can develop a corresponding and integrated applied system, user may access to the equipment via browser at any computer which is connected to the network, user can also config, manage and examine devices through network. So it is of research significance and practical value.As brand new information medium, outdar LED screens have been widely used. Using embedded systems combining wireless communications technology, adopting B/S architecture and modular design methods, this issue designs a wireless LED screen information publishing system. Its purpose is to control LED screens remotely and in large quantities, the setting up for wireless Supervisory Control and Data Acquisition System quicker and more convenient, to allow complex functional requirements become easier to implement, save the heavy coding tasks, enhance system stability and development efficiency.The platform is divided into four parts:1.Data Transmit Unit (DTU)DTU is an embedded device whith embedded real-time operating systemμC/OS-Ⅱ.It adopts embedded TCP/IP protocol LwIP to connect to the internet, sends data to local monitoring center via GSM/GPRS network.2.Wireless Communication Service Software (mServer)mServer is a data transfer station.It receives data from DTU and sends it to client. As the same time mServer receives the instructions from client and sends them to DTU.3.Data Center Client (DCC)DCC communicates with database and mServer. On the one hand, It sends the tasks in data base to mServer. On the other hand, it updates data in database according to the feedback informations of mServer.4.Web Client.WEB Client provides the interactive for users.It can stores tasks informations into database and display it via web server.The wireless LED screen information publishing system designed by this paper is the first civil Web LED screen advertising system. The main tast of the author is to develop upper-layer application of DTU,Interface of wireless communication service software,DCC and WEB client. Currently the platform has been finished and widely used, which achieves the purpose of the subject, and demonstrates the significance and application value of research platform.