2. Learning Outcomes
Students can
1. tell the name of input devices
2. Indentify the input devices
3. tell the function of different
input devices
3. Definition of Input Devices
The devices which are used to
enter data and instructions
into the computer are called
input devices.
4. 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
5.
6.
7.
8. 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
9. 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
13. 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
14. 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
16. 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
19. 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
21. 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
25. 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
27. 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