How do digital whiteboards work?
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If you mean how they sense where your pen/finger is, different models work by different methods. Some have a grid of wires behind the board and sense an electromagnetic coil in the stylus. Some have infrared lights in the corners/edges and sensors to pick up where the beams get interrupted. Some use optical sensing with a camera integrated into the projector, sometimes by picking up a light source in the tip of the stylus. Most models require some sort of calibration to line up the touch points with where the projected image falls, usually asking the user to tap a series of targets so it knows where the corners, edges and centre of the image are.
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