presentation on input devices
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Name:- Nitish Xavier Tirkey F.Y.BCA
Date:- 4th October, 2010
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Introduction
Types of Input Device
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Computer cannot understanding our language because it understands only machine language and it can be possible using some devices are called input devices
When we work with computer we need to enter data and instructions to the computer using these devices
These devices convert data and instructions to a form that can be recognized by the computer
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Keyboard
Mouse
Scanner
Joystick
Digital camera
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Keyboard is the most commonly used input devices.
They allow data entry into a computer system by pressing a set of keys neatly mounted on a keyboard
Contains some extra command keys and function keys that affect the operation of computer or keyboard itself
Types of keyboard :
(1). Standard keyboard
(2). Multimedia keyboard
(3).Wireless keyboard
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Mouse is the most popular point-and-draw device It is a must-have input device on modern personal
computers Has 2 or 3 buttons and can be clicked or double-clicked to
perform tasks Optical mouse doesn’t have a ball but uses a laser to
sense the motion Types of mouse:
(1). Serial mouse(2).PS/2 mouse(3).Optical mouse(4).Wireless mouse
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Data scanning devices are input devices used for direct data entry into a computer system from source documents
Common scanner devices are:(1).Magnetic Ink Character Recognition (MICR) reader :- used by banks to process large volumes of cheques and drafts(2).Optical Mark Reader (OMR) scanner :- scanning the answer sheet of an objective type test in which answers are marked by darkening a square or circle space by pencil(3).Optical Character Recognition (OCR) scanner :- used for direct reading of any printed character(4).Barcode reader :- used to read the barcodes printed on practically every item purchased from a department store
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A joystick is a pointing device that works on the principle
of trackball
To make the movement of the spherical ball easier, it is
placed in a socket with a stick mounted on it
On most joysticks, a button on the top is provided to
select the option currently pointed to by the cursor
Commonly used for controlling player movements in video
or computer games
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A computer with a vision-input device consists of digital camera
The camera creates an image of the object in digital form so that It can be stored and interpreted by the computer
The digitized image of the object is matched against similarly formed pre-stored images in the computer’s image database
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