Input devices

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Numeric keypads

(http://vlaurie.com/computers2/graphics/numeric_pad.gif)

Uses:                                                                                                    

-when only digits have to be entered
eg. ATMs,mobile phones, PINs for credit/debit cards

Adv. 

  • -small and easy to transport 
  • -easy to cover up when entering a PIN 

Disadv. 

  • -difficult to enter text 
  • -too small for numbers to be 
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touch screen

(http://www.sensigraphics.com/wp-content/uploads/2011/06/touch-screen-keypad.jpg)

uses: 
-ATMs
-retail outlets
-interactive whiteboards

Adv.
-faster entry
-easier to select options than mouse
-less likelihood of slecting wrong option

Disadv.
-difficult to enter data other than from a list
-RSI could result from continual use of finger

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Keyboard

uses:
-standard data input
-includes standard QWERTY layout with a numeric keypad

advantages:
-quick data input
-usually built-in in laptops, no need to buy an extension

disadvantages:
-difficult use for disabled people
-difficult to move the pointer on the monitor

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Mouse

uses: 
-to select or choose an option on the monitor
-draw images 

advantages:
-quick option choosing
-navigates the cursor for advanced usage, such as graphical designing

disadvantages:
-difficult use for disbaled people
-difficult data input

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Joystick

uses:
-rotary lever
-widely use for computer games

advantages:
-easy control
-great for option choosing with some customised buttons

disadvantages:
-difficult use for disabled people
-difficult data input

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Lightpen

uses:
-the tip contains light sensitive element, which detects the light from the screen
-mostly use for drawing in computers

advantages:
-easy usage for drawing
-accuracy for lines in drawings

disadvantages:
-could be uncomfortable to use
-it is not as accurate as digitising tablets

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Tracker Ball

uses:
-has X axis, Y axis, and Z axis
-use for developing 3D environments

advantages:
-easier use for disabled people, more than a standard mouse
-tracker ball cannot be knocked off, no easy damage 

disadvantages:
-movements are not completely precise
-requires more cleaning than standard rolling mouse

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Image Scanner

uses:
-allows information of text and photos into the computer
-for text scanning: use Optical Character Recognition (OCR) program

advantages:
-very accurate
-produce high quality copied images

disadvantages:
-it could take up a lot of memory space
-the quality of the scan depends on the original images

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Barcode/ Barcode reader

     

uses:
-quick method of recording information of that item
-barcode is printed lines hat contains informations

advantages:
-quick data input
-error-free information input

disadvantages:
-could be easily damaged
-expensive

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magnetic ink character reader (MICR)

uses:
-the magnetic strip cards contains personal information
-widely use as security and shopping

advantages:
-easy access to informations
-information could be update

disadvantages:
-it doesn't work remotely, inconvenience of accessing
-data can be harm by magnetic feilds

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Remote control

uses: 
-control other devices from afar 
-has lots of options

adv: 
-can be a long distance from device
-benefits the disabled with walking diffculties

disadv. 
-the signal from remote to operate devices could be blocked from objects 
-need batteries

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Touchpads

(http://s3.amazonaws.com/digitaltrends-uploads-prod/2014/12/SecurePad.jpg)
uses:
-in built-in laptops 
-used similar to a mouse

Adv. 
-fast and easy to use
 -doesnt have to be plugged in 

Disadv. 
-more dificult to use compared to a mouse 
-diffcult to use for the disabled 

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Graphic tablet

(http://brain-images.cdn.dixons.com/6/9/21732496/l_21732496.jpg)
uses: 
-creates computer grapics
- able to draw out shapes 

adv.
-more accurate than a mouse 
disadv.
-expensive 
-difficult in choosing menu selections 

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Webcam

(http://www.araclub.co.uk/Images/Webcam.jpg)
uses:
-video conferencing 

Adv. 
-can be online constantly 
-provide oppertunity to stay in touch with long distance friends and family 

Disadv.
-limited features
-not portable 

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sensors

(http://www.yazaki-na.com/user_area/content_media/comping/products-sensors.jpg)
uses:
-temperature sensor
-Pressure sensor 
-light sensor 
-sound sensor
-humidity sensor 

Adv.
-more accurate than humans
-readings are taken continously so the microprocessor can take immediate action 
-humans have more time to do other tasks 

Disadv.
-if there is a powercut, readings cannot be taken

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