The Design And Realization Of The Wireless Directly Printing System Of The Electronic White Board

The main task of this dissertation is the design and realization of the wireless directly printing system of the electronic white board. Recently,the electronic white board has been popularly used in Europe and America. But the uses of the electronic white board is limited by the fields and fees to some extent, and in the module of the electronic white board system the section of computer account for much in the aspect of fields and fees. In order to meet the need of market and enlarge the application area of the electronic white board, the wireless directly printing system of the electronic white board is come into being. The wireless directly printing system of the electronic white board has escaped the dependence of the high-level equipment like computers and projector, and can achieve the basic functions, namely, real time report the content that is written on the board, only to use a printing module, which can reduce the cost largely and do favor to the spread and popularization of the products of the wireless electronic white board. The wireless directly printing system of the electronic white board that is introduced in the dissertation is exploited just on the basis of this background. The mainly work and contents of this dissertation are assigned as follows: The whole dissertation is divided into six chapters. In chapter one, it is summarized the electronic white board's development history in domestic and abroad, the significance of exploitation of the wireless directly printing system of the electronic white board and the constitute,function and performance of this system. In chapter two,some methods about near field's and far field's location have been introduced, the location algorithm is shown. And the laser printer control language (PCL5) has been introduced in detail. In chapter three, the function of this system is introduced, and according to this the design and realization of the hardware is shown. In chapter four, according to the function of the system, on the basis of the design of the hardware, the design and the realization of the software in completed. In chapter five, the process of system debugging is introduced, and the performance is analyzed according to the accurate printing result. In chapter six, all the work and the disadvantages of this system are summarized. The main contribution of this wireless directly printing system of the electronic white board is listed as follows: 1,This system adopted HP-6L laser printer. The wireless directly printing system that has appeared in the market can only use spray-ink or heat-sense printer. Compared to these two styles, the laser printer is better not only in the aspect of quality,speed, but also in the aspect of benefit. 2,This system can memorize at least fifteen boards'contents that have been written on the white board. And at present the congeneric products that have appeared in the market can memorize eight boards at the most. 3,This system can make a real-time report of the trace of the writing while printing out, this function can not be seen in the market now. 4 ,This system adopted the wireless data transfer, whose effective transferring distance is more than ten meters. This makes the printing module can receive the writing messages in a relatively long distance from the white board, which conveniences the users. Based on the research work of the wireless directly printing system of the electronic white board, some problems that await being solved are as follows: 1,The recent printing driven program aims only at the HP-6L laser printer, which is not suitable to the other types of printers. In the next step ,we will consider the transplantation of this program. 2,We can change the double RAM into double port RAM, which can reduce the complexity of the system. 3,The algorithm of temperature adjustment is not perfect. This system takes the temperature into account only at the first time of communication, in all aspects...