whiteboard 5 ft. The principle of the resistive film technology is that the basic structure of the electronic whiteboard is composed of a multilayer film, including a horizontal wire resistive film, an insulating mesh, a conductive film, an insulating mesh, a vertical resistive film, etc., and the combined film has the same size as the used area. A fixed voltage is applied to the resistive film. Under the action of no external force, the conductive film does not contact the resistive film, no voltage is measured, and there is no information reaction of the positioning. When a hard object is pressed at a certain point of the resistive film, the current is read by the test circuit through the conductive film. This voltage is related to the position of the touched point. According to the voltage read from the horizontal and vertical directions, it can be converted into the touch point X. , Y direction position. The resistive touch screen is a grid scanning implementation, which is characterized by the fact that when an object is pressed against the surface of the film, it can reflect the position where the object is pressed.