This document discusses various pointing input devices, including mice, touchpads, touch screens, joysticks, light pens, and their functions. It describes the mechanical, optical, and wireless mouse, noting their button and scroll wheel features. Touchpads are used for laptop cursor control by finger movement. Touch screens serve as both input and output devices using screen touching. Joysticks are lever devices used for games, simulations, and robot control. Light pens select on-screen items and allow hand-drawn input. The document concludes with homework questions about pointing device functions and examples.

2. Talk of the Day

3. Input Devices
Unit 2
Prepared by Ms. Samina Ahmed

4. The Pointing Devices

5. The Pointing Devices
Pointing devices allow users to indicate the
function to be performed by controlling the
movement of a pointer on the screen.

6. The Mouse
The electronic mouse is used to point
at objects on the screen and give
commands.
Types of Mouse:
 Mechanical Mouse
 Optical Mouse
 Wireless/Cordless Mouse

7. Mechanical Mouse:
• It has two or three buttons
and a scroll wheel at top.
• It has a ball underneath and
attached by cord to the
system.

8. Optical Mouse
• It has no rotating ball and can be used
on any flat surface.
• It is more precise in positioning the
pointer on screen.
• It puts less pressure on plam.

9. Wireless/Cordless Mouse
It does need cable.
It emits wireless signals to
communicate with the computer.
The signals travel to the computer
through air.

10. The Touch Pad:
• A touch pad is a small flat surface
with buttons.
• Moving a stylus or finger across the
pad, moves the cursor.
• Usually used in laptops.

11. The Touch Screen:
• A touch screen is used both as an
input and output device.
• It consist of a sensitive touch
covered with a plastic or glass layer .
• User enter data by touching points on
the screen.

12. The Joystick:
• It consist of vertical lever mounted
on a base.
• Moving the lever in different
directions moves the cursor.
• Joystick are used in games, flight
simulation programs, and control
robots.
Game controller
joystick
Game pad

13. Flight simulations
Control robots
Playing Games
Uses:

14. The Light Pen:
• It looks like a normal pen connected
to a computer.
• It is used to select items on screen.
• It can also be moved by hand over a
pad to enter drawing into computer.

15. Uses:
To select things
To draw images

16. Activity:
Light Pen
Joy stick
Optical Mouse
Touch screen
Track Pad

17. Any Question

18. Home Work
Do the following question on your copies.
Q.1 What is the function of pointing devices?
Name any three pointing devices and their use.