Input Devices


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all about input devices. scored 19/20 for test.

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Input Devices

  1. 1. Input devices Chapter 3 The ‘Ins’ and ‘Outs’ of systems
  2. 2. <ul><li>Input devices are used to get data into a system </li></ul><ul><li>For e.g. : a mouse </li></ul><ul><li> a keyboard </li></ul>Definition:
  3. 3. <ul><li>The ideal input device would be able to get data into a system as accurately as possible, in the least amount of time without human help. </li></ul><ul><li>The device would be pretty cheap. </li></ul>
  4. 4. <ul><li>The is no such input device and the choice is always the same. </li></ul>
  5. 5. Keyboards <ul><li>There are different types of keyboards </li></ul><ul><li>For e.g. : - ergonomics (concept keyboards) </li></ul><ul><li>- normal keyboard (everyday use) </li></ul><ul><li>- Braille keyboard for the disabled </li></ul><ul><li>- large key color coded, for visually impaired </li></ul>
  6. 7. Mouse <ul><li>Mouse is used to control the cursor that activates programs in the operating system. </li></ul><ul><li>Types of mouse: - tracker ball </li></ul><ul><li> - optical </li></ul><ul><li> - synoptic touchpad laptop </li></ul>
  7. 8. <ul><li>JOYSTICK </li></ul><ul><li>Similar to a tracker ball, but it is mainly used in games, but can also be used as in scanners in hospitals. </li></ul><ul><li>LIGHT PEN </li></ul><ul><li>The screen cursor can be move by touching the screen with the pen. </li></ul>
  8. 9. <ul><li>TRACKER BALL </li></ul><ul><li>The turns a ball to move the cursor but mouse itself is always still. </li></ul><ul><li>TOUCH SENSITIVE PADS </li></ul><ul><li>Also known nowadays as the synoptic touch pads. Uses your finger to move the cursor and acts as pressure pad for selections. Used on laptops </li></ul>
  9. 11. <ul><li>It is a special screen, when touch with the finger it gives commands just like a light pen. </li></ul>TOUCH SCREEN
  10. 12. Graphic Tablets <ul><li>Like an electronic tracing paper used for graphic designing. </li></ul>
  11. 13. Magnetic stripe reader <ul><li>Used to read credit and debit cards. </li></ul><ul><li>Often called EPOS (electronic point of sale.) </li></ul>
  12. 14. Barcode Readers <ul><li>Used in supermarkets, library systems, luggage handling </li></ul><ul><li>Record from meters or more. </li></ul>
  13. 15. Optical character readers and Optical character recognition (OCR) <ul><li>Inputting text using a scanner then turning them into ASCII code, not picture but edited as word document. </li></ul><ul><li>Cannot distinguish between certain character and numbers: S and 5 or B and 8 </li></ul>
  14. 16. Magnetic character reader & optical character recognition (MKR) <ul><li>Strange numbers at the bottom of checques. </li></ul><ul><li>Iron added to make ink magnetic. </li></ul><ul><li>Read through a special reader called magnetic ink character readers. </li></ul><ul><li>Account number, branch code, checque number= magnetic ink </li></ul>
  15. 17. Optical mark readers and optical mark recognition [OMR] <ul><li>Sense marks made on certain places on special sheet. </li></ul><ul><li>Answer sheet marking, capturing data from questionnaires MCD’s </li></ul>
  16. 18. Optical mark readers and optical mark recognition [OMR] <ul><li>ADVANTAGE </li></ul><ul><li>Does not have to be types in </li></ul><ul><li>Reduce cost of inputting </li></ul><ul><li>Results of tests are needed very fast. </li></ul><ul><li>DISADVANTAGE </li></ul><ul><li>Public don’t follow instruction </li></ul><ul><li>Creased or folded forms have to be done manually, machines rejects it. </li></ul>
  17. 19. Punched cards <ul><li>Punched cards = Before keyboards </li></ul><ul><li>Reads through notes </li></ul><ul><li>Stock record </li></ul>
  18. 20. Kimball Tags <ul><li>Tagged to clothing for payment. </li></ul>
  19. 21. Voice recognition <ul><li>Speaks directly with computer </li></ul><ul><li>Useful to handicaps with limited movement </li></ul><ul><li>Uses microphone </li></ul>
  20. 22. Microphone <ul><li>Speech recognition system </li></ul><ul><li>Voice mail </li></ul><ul><li>Record voice </li></ul>
  21. 23. Electronic point of sale <ul><li>Cash registers </li></ul><ul><li>Act as terminal to main computer system </li></ul><ul><li>Useful management system </li></ul>
  22. 24. Electronic fund transfer at point of sale (EFTPOS) <ul><li>Transfer funds from your bank account to stores account using debit cards </li></ul><ul><li>Debit card – fast method of payment </li></ul>
  23. 25. Video digitizer <ul><li>Combination of hardware and software that converts analogue signal into digital signal. </li></ul><ul><li>Taking a video frame and digitizing it is also called image grabbing. </li></ul><ul><li>Examples are: magazines or pop videos </li></ul>
  24. 26. Scanner <ul><li>Used to scan text or pictures. </li></ul><ul><li>Scan photos that can be used in desktop publishing. </li></ul><ul><li>Example is the OCR. </li></ul>
  25. 27. Digital cameras <ul><li>Takes digital photos and does not need any film. </li></ul><ul><li>Pictures can be resized and cropped to as precise as possible. </li></ul><ul><li>They are saved into the HDD. </li></ul><ul><li>No picture developing Cost. One time investment. </li></ul>
  26. 28. Web camera also known as WEBCAMS. <ul><li>Used to capture images and videos. </li></ul><ul><li>Helps in video conferencing. </li></ul><ul><li>The quality of the camera is very bad therefore the pictures will not be very good. </li></ul>
  27. 29. Advertising <ul><li>Cruise companies place them in ships so that potential customers can see what is going on inside the ship at a particular time. </li></ul>
  28. 30. Checking the weather in another part of the world. <ul><li>You can see how the weather is in another part of the world through a webcam by just watching the pictures broadcasted by another web cam somewhere else. </li></ul>
  29. 31. Touch tone telephones. <ul><li>They have a different number for each number pressed. </li></ul><ul><li>Can be used as data entry device. </li></ul><ul><li>Once connected the customer can use its services, such as statement requests. </li></ul>