Input devicesBy Bhushan

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INPUT DEVICES

• An input device is any device that provides input to a computer. There are dozens of possible input devices, but the two most common ones are a keyboard and mouse.

input devices are a vital part of every computer system.

Some examples include joysticks, keyboards, microphones, scanners, webcams, card readers, touch screen, etc.

• In computing, a keyboard is a typewriter-style device, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. Following the decline of punch cards and paper tape, interaction via teleprinter-style keyboards became the main input device for computers.

Keyboard

A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or execute computer commands.

Light pen

A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.

A light pen detects a change of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer.

MouseIn computing, a mouse is a pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows for fine control of a graphical user interface.

Physically, a mouse consists of an object held in one's hand, with one or more buttons. Mice often also feature other elements, such as touch surfaces and "wheels", which enable additional control and dimensional input.

BARCODE SCANNERA barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electric al ones.

Additionally, nearly all barcode readers contain decoder circuitry analyzing the barcode's image data provided by the sensor and sending the barcode's content to the scanner's output port.

XBOX 360 CONTROLLERThe Xbox 360 Controller is the primary controller for Microsoft Corporation's Xbox 360 console and was introduced at E3 2005. The Xbox 360 controller comes in both wired and wireless versions.

Original Xbox controllers are not compatible with the Xbox 360. The controller is also compatible with PCs; the wireless version requires a Wireless Gaming Receiver.

The wireless controllers run on either AA batteries or a rechargeable battery pack. The wired controllers may be connected to any of the USB ports on the console, or to an attached USB hub.

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