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Input Devices (Scanner-Scanners can be used to convert images or text on…
Input Devices
Scanner-Scanners can be used to convert images or text on paper into a digital format that can be used by the computer.
Advantage: Any image which is digitised by the scanner can then be included on electronic documents.
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Concept keyboard-A concept keyboard is a flat board that contains a grid of buttons. Each button can be programmed to do whatever you want.
Advantage: Much faster for making non-text selections such as menu choices on the till of a fast-food outlet.
Disadvantage: Poor for text or numeric input - although some keyboards do include a numeric keypad so the operator can enter the amount sold.
Touchscreen-A device where you view the options available to you on the screen and you then use your finger to touch the option that you have chosen.
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Graphics tablet-Are used for producing much more accurate drawings on the screen than they could with a mouse or other pointing device.
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Disadvantage: Not really suitable for general selection work such as pointing and clicking on menu items
Sensors-Sensors are used to detect physical quantities outside a computer such as light, temperature and pressure.
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Magnetic Stripe Reader-They read the data on the card, it is 'swiped' through a Magnetic Stripe Reader machine and the data is read and fed back to the computer.
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Touchpad-An alternative for a mouse which requires you to tap or slide on the surface to move or select items
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Disadvantage: Moist, sweaty or calloused fingers can disrupt the signals picked up by the sensors.
Remote controls-A remote control is a hand-held device which is used to control a machine from a short distance away.
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Disadvantage: Remote controls need line-of-sight in order to send their signals to the receiving device.
Joystick-An input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.
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Disadvantage: Joysticks are not particularly robust and can break easily if too much force is used on them.
Chip and Pin reader-Used in credit card transactions after the person who inserts their credit card inputs there pin to verify it's their card
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