Traditional infrared touch-screens cann't be used in complex environment and also cannot meet all the demands of users because of the difficult in accurate positioning multi-point touch

the low resolution and the slow response.The article puts forward the design of infrared touch-screen based on ARM(Advanced RISC Machines)Cortex-M3 kernel STM32F103 processor

constructed the system architecture and application.Full scan of using

X

axis and

Y

axis at both ends of the reverse greatly improves scan efficiency

as well as response speed. The angle scanning algorithm can position multi-point touch accurately.The tilt scanning uniaxial fixed-point algorithm can ensure that the infrared touch screen can work normally in complex situations such as in large obstructions.The design of the infrared touch screen with a standard USB port connect with the upper computer

so that it can widely be used in all kinds of terminal.