A pen-shaped instrument which is used to input commands onto a computer screen, graphics tablet, or a mobile device is called a stylus or a stylus pen . For personal digital assistants, these pen-like input devices act as primary input devices. It is further used in handheld game consoles such as 3DS and Nintendo DS. In various touchscreen devices, a stylus is used to make selections by tapping it on the device screen or by drawing an instruction. This device can replace a pointing device such as a mouse or a trackpad. This technique is often known as pen computing. Technological advancements have taken place in tablets and with that the opportunity for usage of stylus has gained momentum. Following the development of educational curriculum into technologically advanced alternatives, more institutions are incorporating interactive and smart mode of learning. This mode of progressive learning has led to substantial growth in demand for interactive whiteboard (IWB) and stylus pen. The d...