Input Devices

Input Input is any data or instructions entered into the computer in the form of signals The input into the computer can be entered: Through keyboard By selecting commands on the screen and then clicking with mouse By pressing finger on touch screen By speaking into a microphone By sending image through digital camera By scanning data printed on paper through scanner

Input Devices The devices that are used to enter data and instructions or commands into the computer Eyes and ears of computer Commonly used input devices are: Keyboard Mouse Joystick Light Pen Digital Scanner Floppy drives, hard disks and CD drives are used for both input and output devices

Keyboard Most commonly used input device Contain keys for each alphabetic characters, digits and special characters Used to feed data and instructions into a computer by pressing related keys on the keyboard

Keyboard http://menotek.com/101899.html

Keyboard http://computerhws.blogspot.com/2011/08/parts-of-computer-keyboard.html

Types of Keyboard QWERTY Enhanced Keyboard Cordless Keyboard Portable keyboard Ergonomic keyboard Gaming keyboard Virtual keyboard

Pointing Devices A pointer represents a small symbol on the screen Appears on the screen in Graphical User Interface For example, an arrow appears on the screen in Windows environment A pointing device is an input device that is used to control a pointer on the screen Used to select item on the screen, to select commands from the command menu, to draw graphs etc Mouse, Joystick, Trackball etc are examples of pointing devices

Mouse Pointing input device Used to input instruction with a pointer on the screen Moved on the flat surface to control the movement of the cursor or pointer on the screen Has two or three buttons on the top of its body Used to select any option from the group of options by pointing the mouse pointer on it and then clicking one of the mouse buttons

Mouse http://microsoft.com

Types of Mouse Mechanical Mouse Optical Mouse Cordless Mouse Air Mouse

Types of Mouse https://techexplainer.wordpress.com/2012/03/23/different-types-of-computer-mice/

Trackball Pointing input device Like a mouse but it is a stationary pointing device with a ball on its top https://en.wikipedia.org/wiki/Trackball

Touchpad Also known as track pad Small, flat, rectangular, stationary pointing device Sensitive surface of 1.5 or 2 inches Mostly used in laptops http://news.softpedia.com/news/how-to-toggle-or-disable-laptop-touchpad-in-windows-487428.shtml

Joystick Pointing input device Small box with a moving handheld stick and buttons Stick is used to control the movement of the pointer on the screen Button is pressed to activate certain events http://onlinemca.com/mca_course/kurukshetra_university/semester5/computergraphics/joy_stick.php

Light Pen Another input pointing device Detect the presence of light Handheld pen shaped device with a photocell mounted at its front end Used by engineers, graphic designers etc Used in PDA’s and other hand held computers

Light Pen http://www.igcseict.info/theory/2/point/ http://www.bluetrackpromo.com/diamondlightpens.html

Electronic Pen Also called stylus Ballpoint like pen To write texts and draw lines with the help of its pressure Used in graphics application

Electronic Pen http://www.yankodesign.com/2011/10/25/meter-pen/ http:/techkidz.biz/products.html/

Digitizer Flat, rectangular, electronic plastic board Mainly used for drawing purposes in computer aided design applications Makes easy to enter free-hand drawing in the computer http://shaniqueeportfolio.weebly.com/digitizing-tablet.html

Microphone Input device used to enter the sound signals of user into the computer Record the voice of the user in computer Sound card translates the sound signals into digital signals for processing by computer Also translates the sound digital signals back into the analog signals

Microphone http://www.crowriveraudio.com/mics/index.htm

Digital Camera Input device used to take pictures and to store directly into the computer in digital form http://www.sony-asia.com/local/product/dsc-w830

Digital Scanner Light sensing input device Read images and text printed on paper and then translates into electronic form that can be processed and stored by the computer Also called image scanner http://www.freefaxonline.org/how-to-scan-documents-without-scanner/

Optical Reader Device that uses a light source to read characters, marks printed on the paper etc Converts them into the digital form that can be stored and processed in computer Two main types of optical reader: Bar Code Readers Optical Character Recognition

Optical Reader http://www.tutorialspoint.com/computer_fundamentals/computer_input_devices.htm

Touch Screen Sensitive display screen Touch the different areas of screen with the finger tip just as you click different areas with the help of mouse http://www.slashgear.com/lg-et83-touchscreen-monitor-wants-your-windows-8-fingers-31254980/

References Introduction to Information Technology by Riaz Shahid, CM Aslam and Safia Iftikhar The Concepts of Information Technology by Imran Saeed, Ahsan Raza, Tariq Mehmood and Zafar Hussain