4. Input devices
The signals or
data received
by the system
is called input
devices.
• Keyboard
• Mouse
• Webcam
• Barcode
• reader
• Image scanner
• Touch screen
5. Input devices
keyboard
• 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.
mouse
• In computing, a mouse is
a pointing device that
functions by detecting two-
dimensional motion relative
to its supporting surface.
6. Input devices
webcam
• A webcam is a video
camera that feeds its image in
real time to
a computer or computer
network. Unlike an IP
camera (which uses a direct
connection
using Ethernet or Wi-Fi), a
webcam is generally
connected by
a USB cable, FireWire cable, or
similar cable.
Touch screen
• Touch screen A touch
screen is an electronic
visual display that the user
can control through simple
or multi-touch gestures by
touching the screen with
one or more fingers. Some
touch screens can also
detect objects such as
a stylus or ordinary or
specially coated gloves.
7. Input devices
Image scanner
• Image scanner In computing,
an image scanner—often
abbreviated to just scanner—is a
device that optically scans
images, printed text, handwriting,
or an object, and converts it to
a digital image.
Barcode reader
• A 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 electrical ones.
8. Output devices
• Display
device
• Computer
display
• LCD
projector
• printer
The signals
or data sent
from
computer is
called output
devices.
9. OUTPUT DEVICES
DISPLAY DEVICE
• A display device is
an output device for
presentation
of information in visual[1]or t
actile form (the latter used
for example in tactile
electronic displays for blind
people).
COMPUTER DISPLAY
• Computer display
A monitor or a display is
an electronic visual
display for computers. The
monitor comprises the
display device, circuitry and
an enclosure