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Touch sensor controls led and horn
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The touch sensor controls the LED and horn. A uniform electric field is applied to the four vertices RT, Rb, LT and lb of the touch screen to make the lower layer (indium oxide) ITO glass covered with a uniform voltage. The upper layer is a receiving signal device. When the pen or finger presses any point on the surface, the controller detects the change of resistance at the point where the finger presses, and then changes the coordinates.
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