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Group 1

  1. 1. ROLL No. BSIT-F13E124
  2. 2. Name : Sultan Sikandar Roll No : BSIT-F13E121 Topic: Input- Input devices
  3. 3. What Is Input? • Input is any data and instructions entered into the memory of a computer Pages 188– 189 Figure 5-1 Discovering Computers Fundamentals, 2010 Edition Chapter 5 3
  4. 4. DATA is a collection of unprocessed items,including text, numbers, images, audio, and video. INSTRUCTIONS are the commands given to the computer by user to process the data into information(output). Instructions entered into the computer can be in the form of programs, commands, and user responses.
  5. 5. A user response is an instruction a user issues by replying to a question displayed by a program. A response to the question instructs the program to perform certain actions. Assume the program asks the question, Is the time card correct? If you answer Yes, the program processes the time card. If you answer No, the program gives you the opportunity to modify the time card entries.
  6. 6. Types of Input • Voice input is the process of entering input by speaking into a microphone • Voice recognition is the computer’s capability of distinguishing spoken words • Audio input is the process of entering any sound into the computer Page 198 Discovering Computers Fundamentals, 2010 Edition Chapter 5 6
  7. 7. Other Types of Input Page 195 Figure 5-12 Discovering Computers Fundamentals, 2010 Edition Chapter 5 7
  8. 8. What Is Input device? An input device is any hardware component that allows users to enter data and instructions into a computer Page 188 Discovering Computers Fundamentals, 2010 Edition Chapter 5 8
  9. 9. • Examples of Input devices include keyboard, Mouse, Monitor and usb or compact discs etc. • Storage devices, such as disk drives, serve as both input and output devices.
  10. 10. Name : Malik Rahib Roll No: BSIT-F13E122 Topic : Keyboard-an input device
  11. 11. The Keyboard • A keyboard is an input device that contains keys users press to enter data and instructions into a computer Page 190 Figure 5-2 Discovering Computers Fundamentals, 2010 Edition Chapter 5 11
  12. 12. Keyboard • Most desktop computer keyboards have… Page 190 Discovering Computers Fundamentals, 2010 Edition Chapter 5 12
  13. 13. Usually a keyboard consists of: • Typing area that includes the letters of the alphabet, numbers , punctuation marks and other basic keys. • A Numeric Keypad on the right side of keyboard. • Function keys( two ctrl keys, two ALT keys and a set of arrows) are special keys programmed to issue commands to computer. To issue commands user often press function key in combination with another key(e.g ctrl+S is a short key to save a document.
  14. 14. • Keyboards also often have a windows key(s) and an Application key. When pressed, the windows key displays the windows start menu, and Application key displays an items shortcut menu. • A Toggle key is a key that switches between two states each time the user presses a key. e.g when you press the NUM Lock key, it locks the numeric keypad, so that you can use the keypad to type numbers. When it is pressed again, numeric keypad unlocks so that the same keys can serve to move around a document.
  15. 15. Name : Ahmad Bashir Roll No : BSIT-F13E123 Topic : Keyboard ErgonomicsKeyboard for mobile devices
  16. 16. Keyboard Ergonomics • An ergonomic keyboard has a design that reduces the chance of wrist and hand injuries • Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Ergonomics below Chapter 5 Page 190 Discovering Computers Fundamentals, 2010 Edition Chapter 5 16
  17. 17. Keyboards for Mobile Computers and Mobile devices • Keyboards on mobile devices typically are smaller and/or have fewer keys • Some phones have predictive text input, which saves time when entering text using the phone’s keypad Page 191 Figure 5-3 Discovering Computers Fundamentals, 2010 Edition Chapter 5 17
  18. 18. • A typical notebook computer keyboard usually has only about 85 keys. To provide all of the functionality of a desktop computer keyboard, manufacturers design many of the keys to serve two or three purposes. • In smart phones, there is a built in on-screen keyboard, where you press the on screen keys using a stylus or your finger. • Some smart phones have one key for each letter of the alphabet, often called a mini keyboard.
  19. 19. Pointing Devices Page 189 Discovering Computers Fundamentals, 2010 Edition Chapter 5 19
  20. 20. Page 192 Figures 5-5 – 5-7 • A touchpad is a small, flat, rectangular pointing device that is sensitive to pressure and motion Discovering Computers Fundamentals, 2010 Edition Chapter 5 Pointing Stick • A trackball is a stationary pointing device with a ball on its top or side Touchpad Trackball Pointing Devices • A pointing stick is a pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard 20
  21. 21. Mouse • A mouse is a pointing device that fits under the palm of your hand comfortably – Most widely used pointing device on desktop computers • A mouse can be wired or wireless Pages 191 – 192 Figure 5-4 Discovering Computers Fundamentals, 2010 Edition Chapter 5 21
  22. 22. • With a mouse, user controls the movement of the pointer, often called a mouse pointer. As you move a mouse, the pointer on the screen also moves. The top and sides of a mouse have one to four buttons. The bottom of the mouse is flat and contains a mechanism that detects the movement of the mouse. Pointing devices
  23. 23. Name: Amber Noor Malik Roll NO: BSIT-F13E124 Topic : Using a Mouse
  24. 24. Using a Mouse • Windows users work with a mouse that has at least two buttons. For a right-handed user, the left button usually is the primary mouse button, and the right mouse button is the secondary mouse button. Left-handed people, however, can reverse the function of these buttons.
  25. 25. • Some programs also use keys in combination with the mouse to perform certain actions. For example, when you hold down the ctrl key while rolling the wheel, text on the screen becomes larger or smaller based on the direction you roll the wheel. The function of the mouse buttons and the wheel varies depending on the program.