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Input Devices

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Input Devices

  1. 1. Input Devices <br />
  2. 2. INTRODUCTION<br /><ul><li> When we work with computer we need to enter data and</li></ul> instructions to the computer using some devices<br /><ul><li> These devices are called input devices
  3. 3. These devices convert data and instructions to a form that can</li></ul> be recognized by the computer<br /><ul><li> Some of the commonly used input devices are :
  4. 4. Keyboard
  5. 5. Mouse
  6. 6. Scanner
  7. 7. Joystick
  8. 8. Microphone
  9. 9. Digital camera </li></li></ul><li>KEYBOARD<br /><ul><li> Standard input device attached to all computers
  10. 10. Layout is same as the traditional typewriter of the type </li></ul> QWERTY<br /><ul><li> Consists of near-rectangular buttons called “keys” and</li></ul> characters printed on the keys<br /><ul><li> Each key press corresponds to a single written symbol
  11. 11. Contains some extra command keys and function keys that</li></ul> affect the operation of computer or keyboard itself<br /><ul><li> Variations of keyboard :
  12. 12. Multimedia keyboard
  13. 13. Internet keyboard
  14. 14. Folding keyboard
  15. 15. Wireless keyboard </li></li></ul><li>KEYBOARD LAYOUT<br />
  16. 16. STANDARD KEYBOARD <br />
  17. 17. MULTIMEDIA KEYBOARD <br />
  18. 18. WIRELESS KEYBOARD <br />
  19. 19. FOLDABLE KEYBOARD <br />
  20. 20. MOUSE<br /><ul><li>Pointing device used to move a graphical pointer on the screen
  21. 21. Graphical pointer also called cursor
  22. 22. Mouse consists of a small case held under the user’s hand
  23. 23. Mouse has a ball underneath that helps to roll over a flat surface
  24. 24. Screen censors the direction of mouse movement and the </li></ul> cursor on the screen follows the mouse path<br /><ul><li> Has 2 or 3 buttons and can be clicked or double-clicked to perform tasks
  25. 25. Optical mouse doesn’t have a ball but uses a laser to sense the motion
  26. 26. Variations of mouse:
  27. 27. Serial mouse
  28. 28. PS/2 mouse
  29. 29. USB mouse
  30. 30. Optical mouse
  31. 31. Wireless mouse </li></li></ul><li>SERIAL MOUSE<br />
  32. 32. PS/2 MOUSE<br />
  33. 33. USB MOUSE<br />
  34. 34. OPTICAL MOUSE<br />
  35. 35. WIRELESS MOUSE<br />
  36. 36. SCANNER<br /><ul><li>Used to input a picture
  37. 37. Analyzes images, printed text, or handwriting and converts it to digital</li></ul> image<br /><ul><li> Common scanner devices are:
  38. 38. Magnetic Ink Character Recognition (MICR) reader :- used by </li></ul> banks to process large volumes of cheques and drafts<br /><ul><li>Optical Mark Reader (OMR) scanner :- scanning the answer sheet of</li></ul> an objective type test in which answers are marked by darkening a<br /> square or circle space by pencil<br /><ul><li>Optical Character Recognition (OCR) scanner :- used for direct</li></ul> reading of any printed character<br /><ul><li>Barcode reader :- used to read the barcodes printed on practically</li></ul> every item purchased from a department store <br />
  39. 39. MICR READER <br />
  40. 40. OMR SCANNER <br />
  41. 41. OCR SCANNER <br />
  42. 42. BARCODE READER <br />
  43. 43. JOYSTICK<br /><ul><li> Input device that is used to control onscreen objects
  44. 44. A small lever called stick is used instead of cursor keys or mouse
  45. 45. Commonly used for controlling player movements in video or computer</li></ul> games<br /><ul><li> Most joysticks are configured for 2-d movement
  46. 46. Certain joysticks control 3-d movement also</li></li></ul><li>JOYSTICK<br />
  47. 47. MICROPHONE<br /><ul><li> Input device that is used for recording audio in a computer
  48. 48. To do this we also need a sound card installed in computer
  49. 49. Sound card converts analog sound signal to digital form and vice-versa
  50. 50. A speech recognition software is used with microphone :
  51. 51. to dictate text
  52. 52. navigate programs
  53. 53. select commands </li></li></ul><li>MICROPHONE<br />
  54. 54. DIGITAL CAMERA<br /><ul><li> Input device used for capturing and storing still images
  55. 55. We can connect digital camera to a computer and transfer the images from</li></ul> camera directly to the computer<br />
  56. 56. DIGITAL CAMERA<br />

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