2.  Input Devices Input Devices  Examples of Input Devices Examples of Input Devices  Keyboard Keyboard  Pointing Devices Pointing Devices Mouse Joystick Tracker Ball Light Pen

3.  Input devices is any hardware component with the help of which we enter data and instructions into the computer.  Input devices captures information and translates it into a form that can be processed and used by other parts of your computer BACK

4.  Keyboards  Pointing devices  Optical Scanners  Scanners  Electronic Tablet/Pen  Digital cameras  Web cams  Digitizers  Speech Recognition BACK

5.  The keyboard is the most common input device.  The keyboard allows the computer user to enter words, numbers, punctuation, symbols, and special function commands into the computer’s memory. BACK

7.  Typically 101 keys laid out in the QWERTY fashion; connected to the computer by a cable  Designed to help prevent cumulative trauma disorder (CTD) or damage to nerve tissues in the wrist and hand due to repeated motion Enhanced / Extended Keyboard Ergonomic Keyboard BACK

8.  Pointing devices are mainly used to choose and enter commands.  Examples of Pointing Devices are Mouse Joystick Tracker ball Light Pen BACK

9.  Mouse is very Popular cursor control device.  A mouse is a small box with a around ball at bottom.  A mouse is palm sized.  There are two or three depression switches on the top.  As the mouse is moved, its movements are mirrored by the on- screen pointer.  Mouse is rolled on a flat surface.

10. Wheel Mouse Cordless Mouse  Contains a rotating wheel used to scroll vertically within a text document; connects to USB port  Uses infrared signals to connect to the computer’s IrDA port; it must be within sight of the receiving port

11.  Mouse buttons enable the user to initiate actions. ◦ Clicking (left-, right-, or double-clicking) allows the user to select an item on the screen or open a program or dialog box ◦ Click and drag – Holding down the left mouse button and moving the mouse enables the user to move objects on the screen

12.  Joystick is also a pointing device which is used to move cursor position on a monitor screen.  Joystick is a stick having a spherical ball at its both lower and upper ends.  The lower spherical ball moves in a socket.  The Joystick can be moved in all four directions.  It is mainly used in Computer Aided Design and playing computer games.

13.  A Tracker ball is a pointing device which is mostly used in notebook or laptop computer. Instead of mouse.  To move the graphics cursor on the screen, the ball is rolled with hand, the button is pushed with a finger or a finger is simply moved on the square platform.  It requires little arm movement.  It requires less space.

14.  Light Pen is a Pointing device which is used to select a displayed menu item or draw pictures on the monitor screen.  It consists of a photocell and an optical system placed in a small tube.  When its tip is moved over the monitor screen and pen button is pressed,its photocell sensing element detects the screen location and sends the corresponding signal to the CPU. BACK