3.1+IO+Composite+Devices

=__Composite Devices__=

__Examples of the composite Devices__


 * Game controller
 * Game Pad (or joy pad)
 * Paddle
 * Wii remote
 * Mouses


 * INPUT**


 * How does a game controller work?**

Each button is a switch that completes a circuit when it is pressed. A small metal disk beneath the button is pushed into contact with two strips of conductive material on the circuit board inside the controller. While the metal disk is in contact, it conducts electricity between the two strips. The controller senses that the circuit is closed and sends that data to the PlayStation. The CPU compares that data with the instructions in the game software for that button, and triggers the appropriate response.


 * How does the Wii remote work?**

The Wii sensor bar emits two infrared beams that are picked up by the remote. The distance the remote is from these beams and and the placement of the bar, either above or below the TV, is sent back to the Wii and is processed to allow you to use the remote as a pointer.

The ability of the remote to sense very fine movement to extreme movement, like in Wii Sports Baseball, is very impressive. This functionality is due to three small pieces of internal hardware called accelerometers. There is one accelerometer for each axis: X, Y and Z. In other words, there is one for up and down, one for left and right, and one for forward and backward in relation to the TV. These small devices can measure minuscule amounts of movement all the way up to forces three times the force of gravity.

All of this information has to get back to the Wii console for processing, and this all happens via Bluetooth technology. Each Wii remote is synced with the Wii and communication happens seamlessly.

It is used on Computer and gaming consoles such as the Xbox/Playstation.Mainly for entertainment purposes. A **game controller** is a device used with games or entertainment systems used to control a playable character or object, or otherwise provide input in a computer game.
 * Where is it used?**