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Hardware and input devices


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What is hardware, which input devices are most frequently used nowadays, why are some good to use, while others are outdated? This presentation is an answer to all this questions and it also has a small part about sensors (what are sensors and what types are there)

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Hardware and input devices

  1. 1. Hardware Types of computers Input devices
  2. 2. SMILE
  3. 3. Introduction  Hardware???  Computers are categorised by their size and power!  We are going to focus on hand-held computers  Nowdays most procesing is done on mainframe computers and supercomputers  Some calculations like weather forcast would take enormous time if processed on a your computer.
  4. 4. Airlines and large hotels need also very capable computers alse they would not be able to do simple search due to their large database size!!!!!!!!! For these and many other reasons we do need powerfuil computers
  5. 5. Microcomputers & microprocessors  Computers we use are called microcomputers  However all computers consist out of following parts:  Input devices  Output devices  Processor  Storage device
  6. 6. Homework!!!!!!!  Try to find examples (& pictures) of big size computers!!!!!!!!!!!!!!
  7. 7. Cont.....  Processor consist out of number of different parts  all of these parts fit on one small chip  microprocessor  All on one chip  integrated chips.  Microprocessors are dedicated devices  Why?  You can’t take microprocessor out of you microwave and put it into your washing mashine.
  8. 8. Input devices  No use of computers if you cannot tell it to do something!  We need input devices  data & commands  When thinking of input devices  what is needs to input to the computer!!!!  An input device lets you communicate with a computer. You can use input devices to enter information and issue commands. A keyboard, mouse, scanner, digital camera, touch pads and joystick are examples of input devices.
  9. 9. Keyboards  Invented 100 years agoUsed to type data into the computer  Most common input device today  Has special keys for giving the computer commands  Commands tell the computer to do something, like save the file  These special keys are called command or function keys  There is no specific standard but we have stuck to the qwerty keyboard  Different types of keyboards  It depends what we need to input  ATM keyboard, piano keyboard, alarm system keboard etc.
  10. 10. Pointing devices  Touch-sensitive screens are nice thing but not in all situations!  When we have to select something that is to small for our finger it is better to use  pointing devices  Mouse  one of the pointing devices  Laptops have tracker balls or a touch pad  Joystick allows to give direction used for game playing and more serious once  aircraft navigation
  11. 11. Mouse - most common pointing device
  12. 12. Track ball - basically an upside down mouse
  13. 13. Joystick
  14. 14. Game controller
  15. 15. Video digitiser and scanners  Everything around us is in analog form  So we need to store and analoge picture in a computer  We need analoge to digitale converter (A/D converter)  Video digitiser is a device like scanner that converts anal. picture into digit. picture  Picture is split into number of pixels  same in digital cameras
  16. 16. Scanners  A scanner allows you to scan documents, pictures, or graphics and view them on the computer. You can also use software to edit the items you scan.  Used to put printed pictures and text into a computer  Converts an image into dots that the computer can understand  To scan text, optical character recognition (OCR) software is needed
  17. 17. Remote control Uses usually infrared beam Every time to press a button it will send some coded data
  18. 18. Digital cameras  Used to take electronic pictures of an object  The pictures taken by a digital camera can be used directly by a computer 
  19. 19. Video Capture Card  Usually place inside the computer's case  Use to put video into a computer  Need a video source, either a video camera or video recorder
  20. 20. Magnetic input devices  These are not storage devices  Magnetic input devices come in two forms:  Magnetic stripes  put usually on a back of credit and bank cards  contain information about the card holder it is read by magnetic stripe reader  Magnetic ink specilized ink very easy for machine to read it by magnetic ink character recognition MICR  account numbers on cheques.
  21. 21. Optical mark readers  OMRs  devices used to read marks made in pencil or other forms of documents  It is sometimes very practical and usefull  Multiple choice questions or survey results, signitures or whole documents.
  22. 22. Graphics tablets  It is used with stylus to input freehand work into a computer  It is practical for those disabled who cannot use keyboard or mouse  What ever you draw or write is going to be transfered to the computer
  23. 23. Light pen  It is used as a pointing device  User points at the screen and the computer uses information about timing and light intensity to highlight the position on the screen  It is very much usefull for filling in onscreen data-capture forms
  24. 24. Microphones  It is used to input sound to a computer  Sounds are analog data so they have to be converted into digital form  Microphones can be used for voice recognition applications as well as for voice commands
  25. 25. MIDI  Most of the musical instruments are electronic and a computer is electronic  Still musical instruments cannot directly communicate with computers  We need device called MIDI  musical instrument digital interface
  26. 26. Sensors  Devices that input data automatically from the physical world  There are two sort of sensors:  Ones that sensor things that human being can detect (temperature & light)  Ones that sensor things that human beings cannot detect (magnetism, microwave beam)
  27. 27. The main sensor types are: TEMPERATURE SOUND MAGNETISM RADAR LIGHT PRESSURE TOUCH MICROWAVE PROXIMITY SENSORS PROXIMITY SENSORS PROXIMITY SENSORS Proximity sensors  measure how close something is to sensor.