A joystick is a control device that enables a user to move an object on the screen. It is also known as paddle. It is mainly used for playing video games. It contains a small vertical lever, also called the stick, which is set into two crossed grooves and can be moved left, right, forward and backward. The movement of the stick is sensed by a potentiometer and the instructions are sent to the CPU for the movement of the object on the screen.
