Mouse

__Mouse__ A computer mouse is an input device. Moving a mouse along a flat surface can move the on-screen cursor to different items on the screen. Items can be moved or selected by pressing the mouse buttons (called clicking). A mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Most commonly used with your hand. Mouse have other feautures as well such as a wheel, this is commonly put between the buttons which can be used for scrolling down pages or zooming in or out on a page or document.

There are different types of mouse;
 * Mechanical- With a ball
 * 1) moving the mouse turns the ball.
 * 2) X and Y rollers grip the ball and transfer movement
 * 3) Optical encoding disks include light holes.
 * 4) Infrared LEDs shine through the disks.
 * 5) Sensors gather light pulses to convert to X and Y vectors
 * Laser- Use LED's and an array of photodiodes to detect movement
 * 3D
 * Inertial and gyroscopic- dont require a surface to operate.