Around the whiteboard, paired infrared emitting and receiving devices and infrared rays between the emitting and receiving tubes form an infrared network, which covers the surface of the whiteboard. Any opaque object touching the surface of the whiteboard will block infrared rays, resulting in no signal or weak signal. By calculating the signal strength and the position of the infrared device, the touch position can be determined. The advantage of infrared technology is that it can operate any object without special pens and consumables. There is no contact between the operating surface and the induction device, so there is no wear and aging problem and the service life is long. At the same time, the board is not afraid of damage, even if it is damaged, it will not affect the normal use. Mature and stable technology. Today's infrared technology has the characteristics of light resistance, dustproof and waterproof, and it is also the first choice of touch technology in various harsh application environments. Connection mode of infrared interactive electronic whiteboard with projector and computer: USB VGA electronic whiteboard is not only a display curtain, but also a touch screen, which is connected to the computer through a USB cable. The computer projects the video signal of the screen onto the surface of the whiteboard through the projector. Through software calculation, the touch position on the whiteboard can correspond to the mouse information of the computer. With all kinds of application software, the large-screen interactive operation can be realized, which can be applied to various occasions such as teaching, conference, command and remote cooperation, and realize interactive, dynamic and multimedia operations and applications that cannot be realized by traditional methods.