Computer Fundamentals : Input Devices

Important computer fundamentals Input devcies

• Keyboard • Mouse
• Joy Stick
• Light pen
• Track Ball
• Scanner
• Graphic Tablet
• Microphone
• Magnetic Ink Card Reader(MICR)
• Optical Character Reader(OCR)
• Bar Code Reader
• Optical Mark Reader(OMR)

1) Keyboard

Keyboard is that the commonest and really popular data input device which helps in inputting data to
the computer. The layout of the keyboard is like that of traditional typewriter, although there
are some additional keys provided for performing additional functions.
Keyboards are of two sizes 84 keys or 101/102 keys, but now keyboards with 104 keys or
108 keys also are available for Windows and Internet.

The Key on the keyboard are as follow:

1Typing KeysThese keys include the letter keys (A-Z) and digit keys (0-9)
which generally give same layout as that of typewriters.
2Numeric KeysIt is used to enter numeric data or cursor movement.
Generally, it consists of a set of 17 keys that are laid out in
the same configuration used by most adding machines and
3Function KeysThe twelve function keys are present on the keyboard which
are arranged in a row at the top of the keyboard. Each
function key has unique meaning and is used for some
specific purpose.
4Control KeysThese keys provide cursor and screen control. It includes four
directional arrow keys. Control keys also include Home, End,
Insert, Delete, Page Up, Page Down, Control(Ctrl),
Alternate(Alt), Escape(Esc).
5Special Purpose KeysKeyboard also contains some special purpose keys such as
Enter, Shift, Caps Lock, Num Lock, Space bar, Tab, and Print
computer keyboard

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2) Mouse

Mouse is hottest pointing device. it’s a really famous cursor-control device having a
small palm size box with a round ball at its base which senses the movement of mouse and
sends corresponding signals to CPU when the mouse buttons are pressed.

Mouse is hottest pointing device. it’s a really famous cursor-control device having a
small palm size box with a round ball at its base which senses the movement of mouse and
sends corresponding signals to CPU when the mouse buttons are pressed.

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3) Joystick

Joystick is additionally a pointing device which is employed to maneuver cursor position on a monitor screen.
It is a stick having a spherical ball at its both lower and upper ends. The lower spherical ball
moves during a socket. The joystick are often moved altogether four directions.

The function of joystick is analogous thereto of a mouse. it’s mainly utilized in Computer Aided
Designing(CAD) and playing computer games

4) Light Pen

Light pen may be a pointing device which is analogous to a pen. it’s wont to select a displayed menu
item or draw pictures on the monitor screen. It consists of a photocell and an optical system
placed during a small tube. When the tip of a light-weight pen is moved over the monitor screen and pen
button is pressed, its photocell detector detects the screen location and sends the
corresponding signal to the CPU.

5) Track Ball

Track ball is an data input device that’s mostly utilized in notebook or laptop pc , rather than a
mouse. this is often a ball which is half inserted and by moving fingers on ball, pointer are often
moved. Since the entire device isn’t moved, a track ball requires less space than a mouse. A
track ball comes in various shapes sort of a ball, a button and a square.

6) Scanner

Scanner is an data input device which works more sort of a photocopy machine. it’s used when
some information is out there on a paper and it’s to be transferred to the hard disk of the
computer for further manipulation. Scanner captures images from the source which are then
converted into the digital form which will be stored on the disc. These images are often edited
before they’re printed.

7) Digitizer

Digitizer is an data input device which converts analog information into digital form. Digitizer can
convert a sign from the tv or camera into a series of numbers that would be stored in
a computer. they will be employed by the pc to make an image of regardless of the camera had
been pointed at. Digitizer is additionally referred to as Tablet or Graphics Tablet because it converts
graphics and pictorial data into binary inputs. A graphic tablet as digitizer is employed for doing
fine works of drawing and image manipulation applications.

8) Microphone

Microphone is an data input device to input sound that’s then stored in digital form. The
microphone is employed for various applications like adding sound to a multimedia presentation or
for mixing music.

9) Magnetic Ink Card Reader (MICR)

MICR data input device is usually utilized in banks due to an outsized number of cheques to be
processed a day . The bank’s code number and cheque number are printed on the cheques
with a special sort of ink that contains particles of magnetic material that are machine
readable. This reading process is named ink Character Recognition (MICR). The
main advantages of MICR is that it’s fast and fewer error prone.

10) Optical Character Reader (OCR)

OCR is an data input device wont to read a printed text. OCR scans text optically character by
character, converts them into a computer readable code and stores the text on the system

11) Bar Code Readers

Bar Code Reader may be a device used for reading bar coded data (data in sort of light and dark
lines). Bar coded data is usually utilized in labelling goods, numbering the books etc. It may
be a hand-held scanner or could also be embedded during a stationary scanner. Universal Product Code Reader scans a
bar code image, converts it into an alphanumeric value which is then fed to the pc to
which Universal Product Code reader is connected.

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