Download - Input devices
Input Devices of Computer
Presented by Ch. Abdul Manan
Learning Outcomes
Students can1. tell the name of input devices2. Indentify the input devices3. 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 padiv) Joystick v) Light pen vi) Digitizer
3. Microphone4. Digital Camera5. 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
Computer Mouse
Mouse
It is used to o control the cursor or pointer.o give commands to the computero create graphics
Trackball
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 computerIt can also attached with keyboardBuilt in keboards
Track pad / Touch pad
Joystick
o It consist of a vertical handleo Like gearshift lever mounted on a baseo One or two buttonso Vertical handle used to control movements of pointero Buttons of joysticks are pressed to activate the certain event or actiono Video games and CAD
Joystick
Light Pen
PDA
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
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
Microphone
Audio input device Use to enter / record sound into computer Main Purpose to provide digital input for multimedia
Digital Camera
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
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