Research And Implementation Of Wireless Multi-User Digital Pen

With the development of science and technology, especially the proliferation ofcomputers, handwriting input in electronic teaching and electro meeting (computers,projectors and other electronic equipment auxiliary discussion meeting) in the application ofmore and more common, the reason will become increasingly common. it can greatly improvethe efficiency of teaching and discussion, and more in line with the natural form ofcommunication. Electronic equipment mainly used in electronic teaching and electro meetingis a computer and projector, and the mode of operation is the document prepared in advance(such as: ppt lesson plans or meeting issues, etc.) to play on the computer through theprojector and enlarged, with in teaching or discussion of the meeting. In teaching or meetingto discuss the process, people often need to impromptu writing, about the content more clearand vivid. Especially in primary and secondary schools, teachers often have to answerquestions of students writing on the blackboard. Electrochemical meeting participants oftenuse the blackboard to discuss the problem, and so close to the natural way of writing or anintegral part of many occasions. In response to this market need, market a variety of relatedproducts, such as various types of interactive whiteboards, interactive whiteboard to someextent further improve the efficiency of teaching or meeting.Interactive whiteboard in the vast majority of the market at a time only one electronicwriting for more than one person simultaneously writing discussion, it is difficult to achieve,the interaction be greatly affected. Interactive whiteboard, wireless multi-user digital pen inthis thesis is a program to solve this problem, it is set to more than one person at the sametime writing the program design can be up to five people at the same time writing up to48digital pen then system into a wireless network to control access to the network in whichdigital pen allows writing this whiteboard will greatly improve the interactive nature of theteaching or meeting by the teacher or the presiding officer.Wireless multi-user digital pen system mainly consists of three parts: a digital pen,adapter and computer. Digital Pen for electronic writing and computer mouse positioningtechnology uses a combination of infrared and ultrasound precise positioning technology,wireless data transmission technology uses the2.4GHz Zigbee technology; adapter entirewireless network access The point is the middle of the bridge of the computer to communicatewith the digital pen; computer is the control center of the system, it multivessel digital pen toform a wireless network adapter control parse the digital pen upload data.Throughout the design, we used computer functions to maximize design ideas, try to put the work of the entire wireless network processing on a computer, the benefits of this designare two aspects, on the one hand can reduce the performance of the adapter microprocessorrequirements to reduce costs; the other hand, is very conducive to the future system upgrade,upgrade try only need to upgrade the computer software, and as little as possible to upgradethe firmware and hardware of the adapter and a digital pen. This design ideology mostimportant point is that the management database on the computer to create an access controlreceiver, the library control allow access system of the digital pen and this can be writtendigital pen.In the design of the entire program, the most critical technology is a wireless networkingtechnology. Wireless physical layer and media access layer, we used Zigbee2.4GHz wirelesstechnology; networking technology, we use the same channels timeshare multiplexing theadapter every several milliseconds launch a sync signal landmark, digital pen used forsynchronization of the entire network, to thereby control the orderly working of the entirenetwork, a working frame is divided into two time domain, competitive access to the timedomain and a receiver time domain, the competitive access time domain for digital pencompetitive access, work time domain is used to the digital pen upload data, the the pollingadapter uses to control digital pen upload data.Through the design program, has developed the product tested basic designrequirements.