They are a common feature of laptop computers and also used as a substitute for a computer mouse where desk space Is scarce. They can also be found on personal digital assistants (Pads) and some portable media players, such as the pod using the click wheel. Also, it is a new type of Hanson multitude device. A touched is perhaps the most common kind of tactile sensor. 4. Joystick A Joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device It is controlling.

Joysticks are often used to control died games, and usually have one or more push-buttons whose state can also be read by the computer. A popular variation of the Joystick used on modern video game consoles is the analog stick. The joystick has been the principal flight control in the cockpit of many aircraft, particularly military fast jets, where center stick or side-stick location may be employed. 5. Microphone A microphone (colloquially called a mice or mike (both pronounced remark/)) Is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.

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In 1876, Mile Berliner invented the first microphone used as a telephone voice transmitter. Microphones are used in many applications such as telephones, tape recorders, karaoke systems, hearing aids, motion picture production, live and recorded audio engineering, FRR radios, megaphones, in radio and television broadcasting and In computers for recording voice, speech recognition, Poi, and for 6. Concept Keyboard An overlay keyboard is a specialized keyboard with no pre-set keys. Each key can be programmed with a wide range of different functions.

Overlay keyboards are often used as a quick and easy way to input items with Just two buttons. Overlay keyboards generally consist of a flat grid of unmarked buttons. After the keyboard is programmed, a sheet, called an overlay, is placed overtook to identify each key. The overlay can consist of any combination of words, symbols, or even pictures 7. Scanner In computing, a scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image.

Common examples found n offices are variations of the desktop (or flatbed) scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to AD scanners used for industrial design, reverse engineering, test and measurement, orthodontics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.