INPUT & OUTPUT DEVICE
INPUT & OUTPUT HARDWRE
• Input hardware consist of devices that
translate data into computer readable form.
• On the other hand, Output hardware consist
of devices that translate information
processed by the computer into a human
understandable form.
INPUT DEVICES
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Keyboard
Mouse
Trackball
Pointing Stick
Touchpad
Touch Screen
Light pen
Digitizer
Scanner
Bar Code Reader
MICR
Sensor
OMR
OCR
Web-Cam
DigitalCamera&Flash chip.
Keyboard
A keyboard typically has 101 or 105
keys.
Keyboard
• A device use to input text
and characters by
depressing buttons.
• Actually it is a way to
input letters or numbers
into different applications
or programs.
• A keyboard also has
special keys that help
operate the computer.
Mouse
Mouse
• A mouse is a pointing device used to move
a pointer on the screen and to make
selections. The mouse is used to open and
close files. The bottom of a mouse has a
rotating ball or an optical sensor that tracks
movement and controls the location of the
pointer.
Optical Mouse
Uses light to
determine mouse
motion.
Mechanical mouse
• Computer mouse that
contains a metal or rubber
ball on its under side.
When the ball is rolled in
any direction, sensors
inside the mouse detect
this motion and move the
on-screen mouse pointer
in the same direction.
Variation of Mouse.
• Trackball : is movable
ball, that can be
rotated using your
fingers or palm.
• Pointing Stick: Looks
like a pencil eraser. It
can be moved with
your finger.
• It is basically used in
Laptop.
• Touchpad: is a small,
flat surface over which
you slide your finger,
using the same
movement you would
with mouse.
• Touch Screen: is a
video display screen
that can be used as to
receive input from the
touch of a finger.
• Touch screen is
popularly used in
ATMs.
Touch Screen
• Light pen: is a light
sensitive pen like
device which allow
users to enter
handwriting and marks
onto a screen by
means of a pen like
stylus rather than
typing on a keyboard.
• Digitizer: It is an
electronic pen which
can convert drawings
and photos to digital
data.
• Scanner: is an input
device which can
translate images of
text, drawings, photos
and the like into
digital form.
BAR CODE READER
• Bar Code:
The vertical zebrastriped marks on most
manufactured retail
product.
BAR CODE READER
• Barcode Reader: are
optical scanners that
can translate the
symbols in the bar
code into digital code.
BAR CODE READER
MICR
• Magnetic Character
Recognition (MICR):
It can read the strange
looking numbers
printed at the bottom
of the checks.
MICR
OMR
• Optical Mark
Recognition:
Device that can read
pencil marks and
converts them into
computer usable form.
Common Use: SAT
Exam, GRE Exam.
OMR
OCR
• Optical Character
Recognition:
Device that can read
preprinted character in
a particular font and
converts them into
digital code.
• Web-Cam: A camera
attaches to a computer
used to record moving
image that can be
posted on a website in
real time.
• Sensor: It is a input device that collects
specific data directly from the environment
and transmits it to a computer. It can be
used to detect speed, movement, weight,
pressure, temperature, wind, smoke, shapes
etc.
OUTPUT DEVICE
Output can be of Two types
Softcopy
Hardcopy
Other
Softcopy Output Device
• Monitor: Display the output. It can be of
two types
[1] CRT Monitor: Cathode Ray tube
Monitor
[2] Flat Panel Monitor: Liquid crystal
display, Plasma, LED.
• Projector: is an output device used to
project information on to a large screen.
CRT Monitor
CRT (Cathode Ray Tube) monitors use
phosphorescent dots to create the pixels that
make up display images.
LCD
Flat Panel Monitors: Flat panel monitors
usually use LCD (Liquid Crystal Display)
or plasma to create output. Light is passed
through liquid crystals to create the pixels.
Hardcopy Output Device
• Printer: output device that can prints
character, symbol, graphics etc on paper or
other hardcopy medium.
• Dot-Matrix Printer
• Laser Printer
• Ink-Jet Printer
• Plotter
• Multifunctional Printers.
• Dot matrix: Dot
matrix printers use a
print head to imbed
images on a surface,
using an ink ribbon.
• Ink jet: Inkjet printers
spray tiny dots of ink
on a surface to create
an image.
• Laser: Laser printers
use toner drums that
roll through
magnetized pigment
and then transfer the
pigment to a surface.
Plotter
Plotters create a hard copy
rendition of a digitally
rendered design. The
design is sent to the plotter
via a graphics card, and
creates the design using a
pen. Generally used with
engineering applications,
plotters basically draw an
image using a series of
straight lines.
OTHER OUTPUT DEVICE
• Sound output Device: Speaker.
• Video Output Device: Photographic images
that are played at 15-29 frames per second
to give the appearance of full motion.