Infrared net based touch screen

Abstract

Touch screen are input devices that allow users interact easily with PC through finger touches on the screen surface. Touch screen was used in many applications of real life, because of its flexibility , efficiency , ease of use and high response, it became one of the most widely used input devices today. Our project is building a touch screen that is dependent on the infrared technology, the screen we created is an infrared aluminum frame that contains a group of senders and receivers , such that there will be a net of infrared beams over the screen surface that will be blocked when receiving a touch . We connected this frame with an interfacing circuit that is controlled by the PC through the parallel port . a software driver installed will be responsible for monitoring the frame by sending control signals to the interfacing circuit and scan the receivers in the frame to detect the touch on the screen. The system worked correctly in most cases , the infrared frame was connected to an interfacing circuit and then to the PC, we received touches on the screen surface and correctly determine the touch position. As a final result, we have succeeded in achieving the actions of click, double click, scroll and right click actions.