touch screen display test.The principle of the infrared touch screen is to place infrared transmitting tubes and infrared receiving tubes on the four sides of the screen. The microprocessor controls the driving circuit to turn on the infrared transmitting tubes and check the corresponding infrared receiving tubes in order to form a cross-shaped infrared light array. information. In this thesis, the ARM7 chip LPC2132 of Philips is used as the microprocessor, and the infrared transmitting tubes are scanned one by one by controlling the shift latch 74HC595 . At the same time, the microprocessor addresses each corresponding infrared receiving tube through the 12C bus. Get the corresponding light intensity value. The microprocessor obtains the touch position information according to the received light intensity signals before and after being blocked, and transmits the information to the host through the serial port. Control means such as shown below:

touch screen display test.The principle of the infrared touch screen is to place infrared transmitting tubes and infrared receiving tubes on the four sides of the screen. The microprocessor controls the driving circuit to turn on the infrared transmitting tubes and check the corresponding infrared receiving tubes in order to form a cross-shaped infrared light array. information. In this thesis, the ARM7 chip LPC2132 of Philips is used as the microprocessor, and the infrared transmitting tubes are scanned one by one by controlling the shift latch 74HC595 . At the same time, the microprocessor addresses each corresponding infrared receiving tube through the 12C bus. Get the corresponding light intensity value. The microprocessor obtains the touch position information according to the received light intensity signals before and after being blocked, and transmits the information to the host through the serial port. Control means such as shown below: 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.