Input & output devices

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Input & output devices

  1. 1. Input & Output Devices V. Saranya
  2. 2. Input deviceEnable to enter data and commands
  3. 3. QWERTY layout 1. Keyboard• Keyboard primary input deviceAdditional spl keys
  4. 4. Input received operation Keyboard Keyboard SystemKeyboard CPU controller Buffer Software 1. Press key 2. A chip (k.C) notes that a key has been pressed 3. K.C has K.B 4. K.C places a code of pressed key in this buffer. 5. K.C indicates S.S that something has happened by sending a signal to it. 6. S.S determine appropriate response. 7. The system reads the code of the pressed key from the keyboard buffer and sends that code to the CPU.
  5. 5. 2. MOUSE• Used to: select menu, access menu & interact with programmes.
  6. 6. Mechanical Mouse • Moving the mouse turns the ball • X and Y rollers grip the ball & transfer movement. • Inside sensors send signals to the computer which tell it the distance, direction & Speed of the ball’s motions.
  7. 7. Optical Mouse • Non mechanical mouse • Emits beam and lights from underside • Use LED • Light reflection is used to judge the distance, direction & speed.f
  8. 8. Usage Benefits• Clicking  Cursor movement• Double clicking  Selecting position• Dragging Button usage determined• Right clicking by: • Os • Application Software • System Software
  9. 9. 3. Trackball
  10. 10. 4. Track pad
  11. 11. 5. Touch Screens• Optical touch screens – Use infra red (1 end) – Light detectors (2nd end)• Electrical touch screens – 2 transparent plates – 1 conductive material – 2resistive material.• Acoustic touch screens – High frequency sound waves
  12. 12. 6. Joystick
  13. 13. 7. Light Pen
  14. 14. 8. Data Glove
  15. 15. 9. Digitizers Used for tracing
  16. 16. 10. Scanners 1. doc/photograph is mounted on a rotating drum. 2. Light beam is directed at the pic and the amount of light reflected is measured by photocell. 3. Drum rotates, the light source moves from one end to the other. Types: 1. Flatbed scanner 2. Sheet fed scanner 3. Hand held scanner 4. Drum scanner.
  17. 17. Output devices• Hardcopy output• Softcopy output
  18. 18. 1. Monitor• Computer sends processed data to the monitor when the user needs to observe the output. – CRT monitor (Cathode ray tube) – Flat panel display.
  19. 19. According to the colors• Monochrome monitors: – Display only one color.• Grayscale monitors – Display various shades of gray• Color monitors. – Display different colors.
  20. 20. CRT monitor
  21. 21. 2. Printers• Drum printers
  22. 22. Dot matrix printers
  23. 23. Ink Jet Printer
  24. 24. Laser Printer

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