Input Devices

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WIMP � Windows icons menus pointer (Windows icon mouse pull down menu) it was used early in the 10’s.


GUI (Graphics User Interface)


How a mouse works � the mouse uses a ball under it which can move north, south, east and west. As the axis pulses are sent to the computer.


Mouse


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• A mouse is a pointing device which is the second most common input device.


• A flat surface is needed for the mouse to function properly.


• A small ball moves and the movements are detected by the way the ball was turning.


• A small arrow moves around the screen using a special ‘mouse driver’. This shows the mouse cursor on the screen.


• A mouse has at least buttons. A left button and a right button. The left button is normally used to make selections. The right one is used for Pop down Menus, which change according to the application being used.


• Touch pads and trackballs are two more pointing devices. They are used instead of a mouse.


Advantages and Disadvantages


• Allows different data to be put and point of the page.


• Good for selecting items from menus.


• Small


• Difficult co-ordinations at first.


• Needs a flat space.


• Dust interferes with use.





Joysticks


• The joystick is usually used for computer games and controlling the way something moves.


• There are movements, up and down or side to side and diagonally. A jump or a gun can be activated by the button which is usually on the joystick.


Advantages and Disadvantages


• Better simulation.


• Specialized used.


• Limited use.


Touch Screens


• When you touch anywhere on the screen it will be detected.


• There are many different ways this can be done


o Infra-Red light shines from the top of the screen to the bottom and from side to side. The screen is divided into a grid and which ever part of the screen you touch the action will happen in.


• Touch Screens can also be used in restaurants or fast food chains because it’s easier than using a whole computer to input data. Only selected items are on the screens which are particular to the specific job.


Digital Cameras


• A digital camera can store a lot more pictures than an ordinary camera.


• Pictures are stored in the floppy-disks or memory cards and can be transferred to the computer.


• Light passes through the lenses. This is how the picture is taken.


• A grid of light sensors is involved.


• Different binary patterns are used to decide the colours of the picture.


• Pictures can be easily saved and changed and edited on the computer.


• Some digital cameras also have film


• They are quite expensive.


Advantages and Disadvantages


• No need to scan pictures.


• No development time or cost.


• Images can be easily edited.


• Resolution not as good as an ordinary camera.


• Can be expensive � up till $1000.


Scanner


• A scanner is used to transfer pictures and text in to a computer.


• There are two types of scanners, hand held and flat bed.


• Scanners work when beams of light pass over an image.


• Different amounts of light refer to the picture. The data is used to produce a digital image of the picture that the computer displays on the screen.


• The data is saved and can be changed.


• You can covert the digital image of text into the text on the screen.


Advantages and Disadvantages


• Saves people having to hand draw images to illustrate typed text.


• Scanned images are more accurate than clip-art.


• Difficult to learn how to use.


• Some images can take up a lot of space.


• Used to be difficult to connect and takes up a lot of space.





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