Input devices


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Input devices

  2. 2. WHAT ARE INPUT DEVICES?They are hardware devices that allow data to be input intothe computer system. This can be done manually (usingManual Input Devices) or automatically (using AutomaticInput Devices). Manual Input Devices: Automatic Input Devices: Adefilola Oladapo Kelvin Keyboard M.I.C.R Mouse O.M.R Touchpad O.C.R Joystick Barcode Reader Scanner Magnetic Stripe Card Touchscreen Sensors Digital Camera Microphone Graphics Tablet
  3. 3. KeyboardsThe ideal input devices that is used to input texts,numbers and instructions (eg CTRL+V) into thecomputerMost keyboards have QWERTY layout. NirvanM 4B
  4. 4. There are different types of keyboards1. Ergonomic keyboards:- Designed to reduce health related problems like RSI.2. Concept keyboards:- Uses icons or phrases instead of standard letters.
  5. 5. Advantages: Disadvantages:1.Fast entry of texts into 1.People with limiteddocuments. arm/wrist may not find it easy to use.2.A well known method ofdata entry. 2.Data entry may be slow.3.Most people find it easy to 3.They use up valuableuse. desk space.4.Easy to do verificationtest.
  6. 6. MICEPointing devices that are used to control the position of apointer on the screen, selecting commands, resizingimages as well as opening, closing and minimisingapplications.
  7. 7. Mice Advantages: Disadvantages:1.Faster to select options. 1.People with restricted hand/wrist movement may2.Rapid navigation through not find it easy to use.applications. 2.They get damaged easily.3.Take up little desk space. Adefilola Oladapo Kelvin 3.They are difficult to use where there is no flat surface.
  8. 8. JOYSTICKS Used in playing computer games and simulations to mimic actual controls. Advantages: Advantages:1.Easier to navigate round a screen 1.A mouse is better and easier inmore than a mouse controlling on-screen pointers2.Control is in three dimensions.
  9. 9. TOUCH SCREENSAllows a user to simply touch the touch the button/icon on the screen toselect a text, task or action. It is mostly used on phones, ipads, petrolstations, ATMs, Interactive boards and other payment methods . Advantages: Advantages: 1.Fast entry of options than 1.Limited number of options keyboards. are available. 2.Very easy to choose 2.Can lead to RSI. options. 3.Screen can get damage or 3.User friendly method of dirty. inputting options 4.. 5.They are tamper proof.
  10. 10. Magnetic Stripe Readers Used to read information on the magnetic stripe found on the back of credit cards, debit cards, security card, etc.Advantages: Disadvantages:1.Data entry is faster. 1.Data are lost when card is damaged.2.Data entered are error free. 2.Card readers do not work in a3.Information held on magnetic distance.stripe is secured.4.It can not be damaged by oil, 3.Information are not readable bywater or moisture. card users.5.They are no moving parts, sothe are physically robust.
  11. 11. Chip and PIN Readers Used where payment are made using cards (e.g. hotels, restaurants, supermarkets, travel agencies.Advantages: Disadvantages:1.Provides more secure 1.Someone else may read the PINpayment system than magnetic while a user is typing in his PIN.stripe.2.Chip does not need to be incontact with the reader.
  12. 12. Scanners Used to scan documents and pictures and convert them into a format for use in various application software.Advantages: Disadvantages:1.Images can be scanned and 1.Quality can be limited, dependingedited. on how good the scanner resolution is.2.They are faster and moreaccurate in data entry.3.It makes it possible to recoverdamaged images anddocuments
  13. 13. Barcode Reader Used in supermarkets, shops, libraries and other companies to read information in the form of barcodes marks on product casings.Advantages: Disadvantages:1.Faster in data entry. 1.It is relatively expensive to setup.2.Less data entry error. 2.It is relatively expensive to manage.3.Enables automatic stock 3.Works with computers or POScontrol. terminals4.When the price of an itemchanges, only the centraldatabase needs to be updated
  14. 14. Optical Mark Recognition Reads marks written in pen and pencils. OMR devices are used to read questionnaires, multiple choice examination papers and many other types of forms where responses are registered in the form of lines or shaded areas.Advantages: Disadvantages:1.Very fast way of inputting the 1.Input data may not be accurate ifresults of a survey/research. forms are not carefully handled or shaded.2.It is more accurate than 2.There may be need for manualkeyboards and OMR. check if forms are not properly filled and this may lead to a waste of time3.Reduce cost of inputting.4.Very useful where results oftests are needed very fast.
  15. 15. Optical Character Recognition Takes scanned text and converts it into a computer readable form. The text can then be used in various application packages.Advantages: Disadvantages:1.It is a more faster data entry 1.It usually have difficulties readingsystem than manually keying in 2.It is not a very accurate technique.2.Number of errors is reduced.Reduce cost of inputtingResults of tests are needed veryfast
  16. 16. Magnetic Ink Character Recognition Reads characters printed in a special ink (containing iron particles). MICR is primarily used to process cheques in banking operations.Advantages: Disadvantages:1.It offers greater security than 1.Only certain characters can beOCR since the printed characters read.cannot be altered. 2.It is a more expensive method of2.There is no manual input, thus data entry.errors are reduced.3.Characters can still be readeven when somebody write onthem.
  17. 17. Digital Cameras Used to produce photographs for transfer to a computer directly or to print out by connecting directly to a printer. Photographs can also be uploaded directly into applications software such as word processors, DTP, etc.Advantages: Disadvantages:1.It produces better quality 1.User needs to be computer literate.photographs. 2.There is some artistry lost since2.Easier and faster to upload some clever software can makephotographs to a computer. corrections to photographs.3.No need to develop 3.Quality of photograph depends onphotographs before printing. quality of camera lens.4.It is easy to delete unwanted 4.Images can easily fill up computerimages. memory.5.Memory card used can storeseveral photographs.
  18. 18. Web Cameras (WEBCAMS) Used in video conferencing. That is, chatting online and at the same time displaying the images of the people in the conversation.Advantages: Disadvantages:1.Can be left on constantly on 1.Pictures are often of poorer quality.the computer rather than using adigital camera. 2.Some webcam need to be connected to the computer before2.Allows images of someone use.faraway to be viewed whilechatting.
  19. 19. Microphones Used to input speech/ sounds to be used in various applications and also in voice recognition software.Advantages: Disadvantages:1.It is faster to read-in text than 1.Sound files can use up a lot ofto type it in using a keyboard. computer memory.2.Sound can be manipulated in 2.Voice recognition software is not asreal time rather than a recording accurate as typing manually. Fordone at earlier stage. instance, it may not be able to3.It can improve safety and distinguish the difference betweensecurity when used in voice ‘there’ and ‘their’.activation systems. E.g.switching on a radio whiledriving.
  20. 20. Graphic TabletLike an electronic tracing paper used for graphic designing.Advantages: Disadvantages:1.It