Touch Screen Calibration Based on Laser Sensors

Abstract

Interactive learning is becoming important in teaching and learning. In particular, the electronic board has educational significance in terms of being able to share and discuss learner's contents with instructors. However, the existing electronic board is not easily used in an educational environment due to the high cost and complicated installation process. This paper propose a mathematical model to calibrate the position of user coordinates by installing two laser sensors and a reflector on a wall. We virtually locate 9 points with software. To validate the algorithm, Raspberry Pi2 is used as a virtual sensor and simulation was performed by PC using RS-232 communication. This algorithm is powerful because up to four pre-saved coordinates are used to provide the higher accuracy.