Input devices

Input Devices of
Computer
Presented by Ch. Abdul Manan

Learning Outcomes
Students can
1. tell the name of input devices
2. Indentify the input devices
3. tell the function of different
input devices

Definition of Input Devices
The devices which are used to
enter data and instructions
into the computer are called
input devices.

Names of Input Devices
1. Keyboard
2. Pointing Devices
i) Mouse ii) Trackball iii)Track pad
iv) Joystick v) Light pen vi) Digitizer
3. Microphone
4. Digital Camera
5. Digital Scanner

Keyboard
It is used to enter text and numeric type data.
Some special keys used to perform special
functions.
The buttons on the keyboard are called keys.
The standard keyboard is Q,W,E,R,T,Y
Keyboard

Pointing Devices
A pointing device is an input device
that is used to control a cursor.
For Example: Mouse, Trackball,
Touchpad, Joystick, Light Pen,
Digitizer

Mouse
It is used to
o control the cursor or pointer.
o give commands to the computer
o create graphics

Trackball
• It performs functions like mouse
• A stationary device
• Moveable ball on its top
• The ball is rotated or rolled with fingers or palm
• The ball is used to control movements of
pointer
• Trackball also has buttons used send commands
• No need of flat surface

Track pad / Touch pad
 It is a pressure sensitive pointing device
 Stationary device
 It has no moving parts
 A small, flat surface
 We slide our fingertip to move pointer
 Pointer moves on the screen
 Some Touch pads has buttons near the surface
 Commonly used with portable computer
It can also attached with keyboard
Built in keboards

Joystick
o It consist of a vertical handle
o Like gearshift lever mounted on a base
o One or two buttons
o Vertical handle used to control movements
of pointer
o Buttons of joysticks are pressed to activate
the certain event or action
o Video games and CAD

Light Pen
 It is a handheld pointing device
 A light sensitive device or pen like device
 It is connected to a computer by a wire
 A photocell on its front end
 When front of the photocell touched with
the monitor screen, it detects a position
on display screen
 The has a button; to select and press
 PDA and other handheld devices

Digitizer / Graphic Tablet
A flat, rectangular, electronic board
Each location on the digitizer points to
corresponding position on the computer screen
Used to make drawings and maps
Stylus and Puck (cursor) are used to trace drawings
and sketches
Digitizer converts the movements of stylus and puck
into digital signals that are sent to computer
Easy to enter freehand drawing into computer

Microphone
 Audio input device
 Use to enter / record sound into computer
 Main Purpose
to provide digital input for multimedia

Digital Camera
 It is used to take pictures in digital form
 Uses a light sensitive processor chip
 Chip capture photographic images in digital
form
 These images are stored in a small diskette or
flash memory chip
 Then image are loaded into computer for further
processing

Digital Scanner / Optical Scanner
 Light sensitive input device
 It reads images and text printed on the
paper
 The translates into electronic form
 That can be processed and stored by
computer
 It uses Laser technology to scan the images

Input devices

More Related Content

What's hot

Viewers also liked

Similar to Input devices

More from FRK NIAZI

Recently uploaded

Input devices