The document defines and describes various types of input devices used to input data and instructions into a computer. It discusses common input devices like the keyboard, mouse, touchpad, microphone, camera, and scanner. It also covers other specialized input devices such as graphics tablets, joysticks, bar code readers, and biometric devices that use fingerprints or facial recognition. All of these input devices allow users to interact with the computer and provide it with the data and instructions needed to perform tasks.

2. WHAT IS INPUT?
The data or
instructions
given to the
computer is
called Input.

3. A hardware component
used to enter data and
instructions into
computer is called
Input Device
WHAT ARE INPUT DEVICES?

4. • Data is mostly entered
using a Keyboard.
• Buttons on the keyboard
are called keys.
• It contains over 100 keys.
• Arrangement of keys on
keyboard is called its
layout.
• Most popular keyboard
layouts are QWERTY and
Dvorak.
KEYBOARD:

5. MOUSE:
• Used to input instructions
with a pointer on the screen.
• Moved on a flat surface to
control the movement of the
cursor or pointer on the
screen.
• Usually has two or three
buttons.
• Buttons are used to perform
different tasks such as
selecting an object or
opening a program etc.
• Also include a wheel to
scroll through long
documents.

6. • Used as an alternative to
mouse.
• Has buttons similar to those
on mouse.
• It has a large rotating ball on
the top.
• The body of the trackball is
not moved.
• The ball is rolled with fingers.
• The position of the cursor on
the screen is controlled by
rotating the ball.
TRACKBALL:

7. TOUCHPAD:
• A small, flat surface over
which the user moves his
fingers.
• The movement of the finger
moves the cursor on the
screen.
• Also known as Track pad.
• Also has one or more buttons
near it.
• Buttons work like mouse
buttons.

8. • A pressure-sensitive
device.
• Similar to a pencil eraser.
• Exists between keys on
the keyboard.
• Pointer on the screen
moves when the user
pushes the pointing stick.
• Requires no additional
space like mouse.
• Normally used in
notebook computers.
POINTING STICK:

9. • A video display screen that
receives input from the touch of a
finger.
• Screen is covered with a plastic
layer.
• There are invisible beams of
infrared light behind the screen.
• User enters data by touching
icons or menus on the screen.
• Most touch screen computers use
sensors to detect touch of a
finger.
• Well suited for simple
applications like ATM.
TOUCH SCREEN:

10. • Consists of a base and a
stick.
• Stick can be moved in any
direction to move an
object around the
computer screen.
• Perform a similar function
to a mouse or trackball.
• Often considered less
comfortable and efficient.
JOYSTICK:

11. • User can write or draw
on a flat surface with a
pen like device to give
input.
• Surface can be a
monitor or a graphic
tablet etc.
• Devices used to give
pen input are stylus
and digital pen.
PEN INPUT:

12. Gamepad
• Used to control
the movement
and actions of
players or
objects in
games.
• A multifunction
input device
• Includes
programmable
buttons, thumb
sticks and a
directional
pad.
Gaming
Wheel
• An input device
that uses a
steering wheel
and a separate
set of foot
pedals to
imitate real-
world driving.
• Most gamming
wheels
incorporate
programmable
buttons as well.
Control
Pad
• Control pad is
an input
device.
• It is used in
audio players.
• It is used to
scroll through
music, adjust
volume and
customize
settings.

13. • An input device to digitally record
audio data such as human voice.
• Can be plugged into a computer or
recorder.
• Many software applications can
accept data with microphone.
• Software in the computer converts
the sound waves into digital form.
• Digital form is stored in memory
and used according to the
requirement.
Microphone
• Used to enter music and other
sound effects in computer.
• Connected to sound card in the
computer.
• User can compose and edit music
and many other sounds using
software.
• Electronic piano keyboard is an
example of MIDI device
Musical Instrument Digital
Interface.

14. Digital
Camera
• Stores images digitally in
its memory rather than
recording on film.
• Pictures taken with a
digital camera can be
transferred to the
computer system using
USB port.
• Can also store images
on flash memory cards,
memory sticks and mini
disks.
Webcam
• Also called pc video
camera.
• A type of digital
video camera that
can be used for
capture video and
still images
• Send e-mails with
video attachments
• Make video
telephone calls on
the internet etc.

15. • Also known as scanner.
• A light-sending input
device.
• Reads printed text and
graphics and translates it
in digital form.
• Many scanners also had
Optical Character
Recognition software.
• OCR can read the
document image and
then convert it into text
that can be edited in word
processor.
Optical Scanners
• Optical reader is a
device that uses a
light source to read
characters, marks
and codes.
• It then convert them
into digital data that
can be processed by
computer.
• OCR and OMR are
optical Readers.
Optical Readers
• Uses a laser beam to
read bar codes and
translate them into
digital signals.
• Digital signals are then
further processed by
computer.
• Bar code consists of
vertical lines and
spaces of different
width.
• Different products like
books, pharmacy, mail,
magazines etc uses
bar codes.
Bar Code
Readers

16. MICR
• Stands for Magnetic-Ink
Character Recognition
Reader.
• Used to read text
printed with magnetized
ink.
• Used by bank industry
for check processing.
RFID
• Stands for Radio
Frequency
Identification.
• Uses radio signals to
communicate with a tag
attached to an object or
a person etc.
• RFID tag contains a
memory chip and an
antenna.
• RFID reader reads
information on the tag
using radio waves.

17. Magnetic Stripe CardReader
• Reads the magnetic stripe on the back of credit
cards and bank cards etc.
• Stripe is divided into three horizontal tracks.
• The magnetic stripe reader reads the information
stored on the stripe when the user swipes the
card.
Biometric Input Devices
• Biometric device converts a personal characteristics
in digital code.
• Digital code is compared with a digital code stored in
the computer.
• Access is not granted if both codes do not match.
• Fingerprint, Facial, Hand Geometry, Voice,
Signatures and Iris are some popular system.