The working principle of the electromagnetic induction interactive whiteboard is: electromagnetic waves can be propagated through the air and insulating objects. The electromagnetic induction type is composed of a pen that can emit electromagnetic waves and a receiving coil film arranged in two directions, horizontal and vertical. The size is the same as the display area. The positioning principle is that a pen that emits electromagnetic waves emits electromagnetic waves in an intermittent manner. When the pen is close to the membrane of the receiving coil, the electromagnetic waves emitted by the pen will be induced on the coil. The higher the electromotive force sensed by the coil group closest to the pen, according to the electromotive force sensed in the horizontal direction and the vertical direction, the X and Y coordinate positions where the pen is located can be obtained by calculation.
Analysis of the advantages and disadvantages of electromagnetic induction technology:
Advantage:
1. The positioning is relatively accurate
2. There is pressure in the writing process, that is, the thickness of the handwriting will be different according to the weight of the writing
3. The uniformity of the display area is good
Disadvantages:
1. You must use a special pen to write, not touch operation. Not convenient for teaching management.
2. The reaction speed is not fast enough, that is, the handwriting appears after the written pen passes
3. Fear of scratching, once the whole board is scratched in the middle, it may not be usable
4. It is difficult to achieve a large area layout
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