In the wave of education informatization, the classroom teaching in schools urgently needs a strength that can integrate the strengths of blackboards and multimedia projections without any shortcomings. It can not only easily introduce and present digital information resources, but also increase at any time as needed. Less adjustment content.
The emergence of interactive whiteboards has brought hope to the realization of this goal.
1 Interactive electronic whiteboard system composition and functional indicators
1.1 Interactive electronic whiteboard system
An interactive electronic whiteboard system refers to a media combination that includes basic components such as an interactive electronic whiteboard, a computer system, and a projection device, with computer hardware and software as the core and a large-sized interactive display interface. Among them, the core components of the hardware system are composed of a whiteboard, a projector, a computer, and an E-Pen (also known as a whiteboard pen and mouse pen).
1.2 Functional indicators of interactive electronic whiteboard
The functions of interactive whiteboard:
(1) Replace the content display function of the curtain
(2) With ordinary whiteboard function
(3) Interactive control function
(4) Record storage function
(5) Resource library function
(6) Network communication and communication function
(7) Auxiliary teaching function
(8) Multi-font recognition function
2 Main hardware construction of interactive electronic whiteboard system
2.1 Design of interactive electronic whiteboard system
Figure 1 System composition of interactive electronic whiteboard
2.2 Scheme design of interactive electronic whiteboard
2.2.1 Electronic Whiteboard
The electronic whiteboard originated in the late 90s. It generally refers to an electronic device: built on the basis of a common white writing board that is close to the blackboard, the operator can use the mouse pen and ordinary pen such as chalk on the interface to write on the blackboard Like writing freely, but unlike ordinary whiteboards or blackboards, through this interface or sensors attached to the interface, the electronic whiteboard can send the position and motion information of the writing pen to a computer or an independent processor. The track is converted into graphic data, and the content of the blackboard is stored and printed. This is the basic function of the electronic whiteboard product. Some improved electronic whiteboard products can also realize the interactive operation of the computer, such as saving the blackboard in a specific format computer file, and networking Send by email, etc. Electronic whiteboards can be divided into three types: copy-type electronic whiteboards (Cype-boards), peripheral electronic whiteboards (Peripheral-boards) and interactive electronic whiteboards (InteracTIve whiteboards). In order to realize the informationization of classroom teaching, the interactive electronic whiteboard is adopted.
2.2.2 Interactive Whiteboard
Interactive whiteboard is an educational or conference-assisted human-machine interaction device. It can cooperate with projectors, computers and other tools to achieve dust-free writing, random writing, remote communication and other functions. From the principle of hardware, interactive whiteboard fusion In addition to large-screen display technology and precise positioning test technology, there are a variety of technologies that can achieve precise positioning of electronic whiteboards. Typical technologies are electromagnetic induction, infrared, resistance, ultrasound, CCD and other technologies. In order to facilitate teaching, infrared interactive whiteboard is used. The following is an analysis of the principles and advantages of infrared technology.
The principle of infrared technology: the horizontal and vertical scanning grids are formed by the infrared receiving and transmitting tubes densely distributed around the display area to form a scanning plane network. When an object that can block infrared light blocks a certain pair of horizontal and When the vertical infrared scanning line is used, the X and Y coordinates can be determined by the infrared position of the blocked horizontal and vertical directions, and the positioning of the coordinates can be achieved.
Advantages of using infrared technology:
(1) Accurate positioning and high precision
(2) No special pen is required, and writing or touching operations can be performed with finger pointers, etc.
(3) Not afraid of scratches, even if there are any scratches in the whiteboard, it will not affect the operation and use
(4) Long service life
(5) Quick response
(6) Low cost
2.2.3 Functional analysis of interactive electronic whiteboard
(1) Substitute the content display function of the projection screen The size of the interactive whiteboard is generally similar to that of a blackboard or ordinary projector screen. The board surface uses high-brightness and low-reflectivity high-grade materials, and some have horizontal and vertical sliding tracks. It moves to a suitable position to receive information from the projector, so it can be used to replace the projector screen to display various digital teaching information.
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