touch screen lcd relay control circuit.The infrared touch system uses the principle that solid objects interfere with the infrared beam. The scanning infrared touch system consists of a series of IR LED diodes and phototransistors arranged in a light matrix frame . LED diodes are mounted on two adjacent sides of the frame. The phototransistors are fixed on two facing sides of the frame (the LEDs face each other). These LED diodes and transistors typically by an infrared beam center 0 . 25 inches distance arrangement.

touch screen lcd relay control circuit.The infrared touch system uses the principle that solid objects interfere with the infrared beam. The scanning infrared touch system consists of a series of IR LED diodes and phototransistors arranged in a light matrix frame . LED diodes are mounted on two adjacent sides of the frame. The phototransistors are fixed on two facing sides of the frame (the LEDs face each other). These LED diodes and transistors typically by an infrared beam center 0 . 25 inches distance arrangement. IQTouch K interactive touch screen feature 20-point touch and dual system -- Android 8.0 system and optional OPS Windows 10Pro system. Its 4K UHD resolution facilitates presentations and collaboration. With optional multi-screen casting software, IQClass 6.0 and installation-free IQClass Plus software, IQTouch K Series can help create an interactive and collaborative teaching atmosphere in class.