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Light Pen
Light pen is input device that utilizes a light-sensitive detector to select objects
on a display screen. A light pen is similar to a mouse, except that with a light pen
you can move the pointer and select objects on the display screen by directly
pointing to the objects with the pen.
Light Pen
Function: It is used to select objects on a display screen.
Stylus
Stylus pens are devices designed for use with touch resistive and capacitive
screens.
Examples of Stylus
Function: These pens allow users to "write" on the touch screen much
as they would a pad of paper, allowing input of handwriting, drawings
and other gestures.
Joystick
Mostly used for computer games, a joystick is lever that moves in all directions
and usually controls some type of movement on the computer. It consists of a
stick on a base with various buttons that have different functions.