Input Devices

charcrawford
Mind Map by charcrawford, updated more than 1 year ago
charcrawford
Created by charcrawford over 6 years ago
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Description

A level ICT (3.1.2 Software + Hardware components of information systems) Mind Map on Input Devices, created by charcrawford on 11/18/2013.

Resource summary

Input Devices
1 Keyboard: most common and widely used.
1.1 Keys: Alphabet keys, Function/ F keys (F3), Numeric keys, Arrow keys and Command keys (insert,delete)
1.2 'QWERTY'
1.3 Using for too long can lead to health problems - repetitive strain injury (RSI)
1.3.1 Ergonomic keyboard has been created - hands in more natural position
2 A piece of hardware used to enter data into a computer
2.1 Manual input devices
2.2 Automatic input devices
3 Mouse: 'pointing device' enables you to control what happens (pointing, clicking, selecting items).
3.1 Two buttons and central wheel (scroll).
3.1.1 Left button: choose menu item
3.1.2 Right button: brings up list of relevant menu items
3.2 Advantages:
3.2.1 Ideal for use with desktop computers
3.2.1.1 Supplied as part of new computer system
3.2.1.1.1 Most familiar with them - little training
3.2.1.1.1.1 Works well in conjunction with keyboard for data entry
3.3 Disadvantages:
3.3.1 Need flat space close to computer
3.3.1.1 Rollers can become clogged with grease
3.3.1.1.1 Overuse can lead to RSI
4 Touchpad: input device usually found on a laptop. Used in place of a mouse.
4.1 Advantages:
4.1.1 Useful for laptops when using a mouse isn't practical
4.1.1.1 Pads position is fixed
4.1.1.1.1 Very short finger movements needed to move cursor
4.2 Disadvantages:
4.2.1 Takes practice and skill to control position of cursor
4.2.1.1 Gloves cannot be worn
4.2.1.1.1 Moist and sweaty fingers can disrupt signals picked up the the sensors
5 Joystick: originally used by pilots -> computer games (more realistic). Move in many directions. Controls machines such as cranes, trucks
5.1 Advantages:
5.1.1 Better gaming experience
5.2 Disadvantages:
5.2.1 Some people may find them more difficult to control
5.2.1.1 Not particularly robust, can break easily
6 Concept keyboard: contains grid of buttons that can be programmed to do whatever you want (can use symbols). Usually for when fast input is needed i.e. Fast food restaurant.
6.1 Advantages:
6.1.1 Much faster for making non-text selections (menu)
6.1.1.1 Waterproof - useful when risk of dirt and splashes
6.2 Disadvantages:
6.2.1 Poor for text/numeric input. (some do have numeric keypad to show amount sold)
6.2.1.1 Limited to options shown on keyboard
7 Touchscreen: only device that works as both an input and output device. View options on screen (output) then use your finger to touch option (input).
7.1 Advantages:
7.1.1 Easy to use, not much training
7.1.1.1 No extra peripherals i.e mouse are needed
7.2 Disadvantages:
7.2.1 Not suitable for inputting large amount of data
7.2.1.1 Not robust, can soon become faulty
8 Scanner: convert images/ text on paper into digital format. Shines beam of light then sensor detects colour that is reflected back and builds up image this way. (Flatbed and Handheld)
8.1 Advantages:
8.1.1 Accurate and reasonably high quality
8.1.1.1 Images can be enhanced once digitalised
8.2 Disadvantages:
8.2.1 Take up a lot of memory space
8.2.1.1 Lose some quality
9 Graphics tablet: Designer can produce more accurate drawings than they would with a mouse. Sensitive tip to have heavier or lighter lines
9.1 Disadvantages:
9.1.1 More expensive than mouse
9.1.1.1 Not suitable for general selection work
9.2 Advantages:
9.2.1 Natural to draw with pen than mouse
9.2.1.1 Great level of accuracy can be achieved
10 Magnetic Ink Character Recognition: Banks process cheques 300 per minute, 100% accuracy this way.
10.1 Advantages:
10.1.1 Quick and very accurate
10.2 Disadvantages:
10.2.1 Reader and Ink are very expensive
11 Optical Mark Reader: detect pencil by reflecting light (less light where the mark is). Sends results to computer (storage, analysis and reporting).
11.1 Advantages:
11.1.1 Fast for inputting large amounts of data
11.1.1.1 Much more accurate than humans
11.2 Disadvantages:
11.2.1 May not be read correctly
11.2.1.1 Not suitable for text
12 Optical Character Recognition: normal scanner and specialist software changes the letters into a form that can be edited/ processed by a word processor
12.1 Advantages:
12.1.1 Cheaper than paying someone manually
12.1.1.1 Much faster
12.2 Disadvantages:
12.2.1 Not 100% accurate
12.2.1.1 Documents need to be checked over
13 Magnetic strip reader: back of credit cards, loyalty cards.. It can hold personal details (60 characters). Swiped through magnetic strip reader machine - info fed top computer
13.1 Advantages:
13.1.1 Simple to use
13.1.1.1 Cheap to produce
13.2 Disadvantages:
13.2.1 Limited storage capacity
13.2.1.1 Data destroyed by strong magnetic fields
14 Barcode Reader: series of vertical bars - give information on country of manufacture, name of manufacturer, product code. Automatic input device
14.1 Advantage:
14.1.1 Any price change only needs to be made to the database and not the packaging
15 Biometric Devices: Fingerprint and retinal identification, facial recognition. UK passport - microchip. But also ATMs, registration.
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