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Input and Output            Gina 10A
InputInput devices allow us to enter raw data into a computer.  The computer processes the data and then produces  outputs...
Manual Input Devices
Keyboard   Made up of buttons,    “Keys”.   “QWERTY” is another    word for keyboard.    Come from the first 6    letter...
Alphanumeric Keyboard Allows: text (abc…) number (123…) Symbols (@#$...)
Numeric Keypad Small keyboard Only have numbers Enter numeric data  into ATM
PIN Pad   Enter Personal    Identity Number (PIN)   Electronic door locks.
Mouse   Pointing device   Sensors on the bottom of    the mouse detect when    the mouse is moved.   Optical or wireles...
Touchpad/Trackpad On laptops Take up less space Use by fingers Control by GUI
Trackball/Tracker Ball   Pointing device   Large ball that user    spins.   Control by GUI pointer   Limited movement ...
Touch screen   Touching the surface   Very intuitive and    simple to use.   Information    terminals in public    plac...
Graphics Tablet   Pointing device   Used by designers and    artists.   Allows natural hand    movements.   Input to g...
Joystick/ Joypad   Playing games   Small joysticks can be    found on some mobile    phones.
Light Pen   Pointing device   Write on screen   Rarely used
Scanner   Scans images, etc.   Taking close-up photograph   Most common scanner is    Flat-bed.
Digital Camera   Digital photographs   Store on memory cards.   Transferred to a computer.   10 Megapixels
Video Camera   Stored on video-tape or    memory cards.   Later transferred to a    computer.   Television production
Web Cam   Very basic video camera   Live video into computer   Low quality   For web chats
Microphone   Converts sound into a signal   Analogue   ADC: Analogue Digital    Convertor
Automatic Input Devices
Magnetic Strip Reader   Strip of material that can be    magnetised on the back.   Data stored in the form of    magneti...
Smart Card/Chip Reader   Chip of computer memory   Smart cards   Data stored in this memory    and read back using a ch...
MICR Reader   Magnetic Ink Character    Recognition   Bank cheques   Quickly & accurately   Cheque number & bank    ac...
OMR Scanner   Optical Mark Recognition   read quickly & accurately   Special OMR forms can be    coloured in.   Marks ...
OCR Scanner   Optical Character    recognition   Convert images of text into    an actual text file   Scanned, scanned ...
Barcode Reader/Scanner   Numeric code   Series of lines   Barcode reader/scanner   Point-of-Scale (POS)   Code   Rea...
Sensors   Senses (5 senses)   Converts a real-world    property into data that    computer can process.   Analogue sign...
Remote Control   Send data signal by    button.   Infrared light or radio    signals   Control a computer from    some ...
Output
CRT Monitor   Displays text & image   Cathode-ray tube (CRT)   Large & boxy   A lot of desk space.   Replaced by flat...
Flat-Screen Monitor (TFT or                LCD)   Replaced CRT monitors   Light in weight   Little desk space   Pictur...
Digital/Multimedia Projector   Very large viewing area    e.g.: presentations for    advertising or watching    movies. ...
Loudspeaker   Music or sounds   Convert electrical signals    into sound waves   Music editing, video    conferencing, ...
Dot Matrix Printer   Tiny pins   Leaves a pattern of dots. Can form    letters, images, etc.   Continuous stationary  ...
InkJet Printer   Cheap, High-quality   Full-colour   Squirts tiny droplets   Full-colour   Tiny holes: jets   Perfec...
Laser Printer   Very complex   Expensive to buy   Very cheap to use   Marks on paper >> toner   Complex system, laser...
Plotter   Draw on paper using a pen   Accurately & quickly   Different coloured pens   Used by designers &    architec...
Motor   Movement   In washing machine,    microwave & air conditioning    units.   Switched on & off
Pumps   Push water   Air along pipes   Part of watering systems    in greenhouses, in    factories.
Buzzer   Provide noise   In microwave oven   Louder noise in siren or    electric bell, e.g. burger    alarm system.
Lights   Light bulbs   LEDs   Provide lights or indicate    something.   E.g. traffic lights, in car    dashboards
Heater/Cooler   Provide heat   Cool things down   Keep a room or a    greenhouse at correct    temperature.   Cooling ...
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Input and output

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  1. 1. Input and Output Gina 10A
  2. 2. InputInput devices allow us to enter raw data into a computer. The computer processes the data and then produces outputs that we can understand using an output device. The processing is mainly handled by the CPU.2 types of Input: Manual Automatic
  3. 3. Manual Input Devices
  4. 4. Keyboard Made up of buttons, “Keys”. “QWERTY” is another word for keyboard. Come from the first 6 letters on the top row of the alphabet keys.
  5. 5. Alphanumeric Keyboard Allows: text (abc…) number (123…) Symbols (@#$...)
  6. 6. Numeric Keypad Small keyboard Only have numbers Enter numeric data into ATM
  7. 7. PIN Pad Enter Personal Identity Number (PIN) Electronic door locks.
  8. 8. Mouse Pointing device Sensors on the bottom of the mouse detect when the mouse is moved. Optical or wireless technology to track mouse movement. control by GUI
  9. 9. Touchpad/Trackpad On laptops Take up less space Use by fingers Control by GUI
  10. 10. Trackball/Tracker Ball Pointing device Large ball that user spins. Control by GUI pointer Limited movement (disabled) Very young, easier to use than a mouse
  11. 11. Touch screen Touching the surface Very intuitive and simple to use. Information terminals in public places e.g museums.
  12. 12. Graphics Tablet Pointing device Used by designers and artists. Allows natural hand movements. Input to graphics application. Hand-drawn sketches
  13. 13. Joystick/ Joypad Playing games Small joysticks can be found on some mobile phones.
  14. 14. Light Pen Pointing device Write on screen Rarely used
  15. 15. Scanner Scans images, etc. Taking close-up photograph Most common scanner is Flat-bed.
  16. 16. Digital Camera Digital photographs Store on memory cards. Transferred to a computer. 10 Megapixels
  17. 17. Video Camera Stored on video-tape or memory cards. Later transferred to a computer. Television production
  18. 18. Web Cam Very basic video camera Live video into computer Low quality For web chats
  19. 19. Microphone Converts sound into a signal Analogue ADC: Analogue Digital Convertor
  20. 20. Automatic Input Devices
  21. 21. Magnetic Strip Reader Strip of material that can be magnetised on the back. Data stored in the form of magnetised dots. Data stored on the strip Data shown on the front of the card. Faster and more accurately Swiping the card through a slot.
  22. 22. Smart Card/Chip Reader Chip of computer memory Smart cards Data stored in this memory and read back using a chip reader. Connect to metal pads The reader can access the memory chip and data stored.
  23. 23. MICR Reader Magnetic Ink Character Recognition Bank cheques Quickly & accurately Cheque number & bank account number are printed at the bottom of the bank cheque. Special magnetic Ink, special front MICR reader
  24. 24. OMR Scanner Optical Mark Recognition read quickly & accurately Special OMR forms can be coloured in. Marks then detected by OMR scanner. Multiple-choice exam answer sheets & lottery number forms.
  25. 25. OCR Scanner Optical Character recognition Convert images of text into an actual text file Scanned, scanned image then analysed by OCR software. Letter shapes handwriting or handwriting recognition
  26. 26. Barcode Reader/Scanner Numeric code Series of lines Barcode reader/scanner Point-of-Scale (POS) Code Read barcode, quick & accurate than typing.
  27. 27. Sensors Senses (5 senses) Converts a real-world property into data that computer can process. Analogue signal converted into digital data for computer. Analogue-to-Digital- Converter (ADC) Use: monitoring, measuring, data logging systems & computer control systems.
  28. 28. Remote Control Send data signal by button. Infrared light or radio signals Control a computer from some distance. Control a presentation slideshow.
  29. 29. Output
  30. 30. CRT Monitor Displays text & image Cathode-ray tube (CRT) Large & boxy A lot of desk space. Replaced by flat-screen monitors. Accuracy & brightness
  31. 31. Flat-Screen Monitor (TFT or LCD) Replaced CRT monitors Light in weight Little desk space Picture quality
  32. 32. Digital/Multimedia Projector Very large viewing area e.g.: presentations for advertising or watching movies. DVD player Satellite receiver Powerful light source
  33. 33. Loudspeaker Music or sounds Convert electrical signals into sound waves Music editing, video conferencing, watching movie.
  34. 34. Dot Matrix Printer Tiny pins Leaves a pattern of dots. Can form letters, images, etc. Continuous stationary Quality is poor Noisy Carbon-copies e.g. airline tickets Duplicate pages all printed in one go. Very cheap Last for a long time e.g. shop receipts.
  35. 35. InkJet Printer Cheap, High-quality Full-colour Squirts tiny droplets Full-colour Tiny holes: jets Perfect for photographs Very quite Cheap to manufacture Ink is very expensive Expensive to use
  36. 36. Laser Printer Very complex Expensive to buy Very cheap to use Marks on paper >> toner Complex system, laser Very fast printing Very common use in offices
  37. 37. Plotter Draw on paper using a pen Accurately & quickly Different coloured pens Used by designers & architects Huge pieces of paper
  38. 38. Motor Movement In washing machine, microwave & air conditioning units. Switched on & off
  39. 39. Pumps Push water Air along pipes Part of watering systems in greenhouses, in factories.
  40. 40. Buzzer Provide noise In microwave oven Louder noise in siren or electric bell, e.g. burger alarm system.
  41. 41. Lights Light bulbs LEDs Provide lights or indicate something. E.g. traffic lights, in car dashboards
  42. 42. Heater/Cooler Provide heat Cool things down Keep a room or a greenhouse at correct temperature. Cooling unit Keep food fresh
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