Input DevicesManual and Automatic

By Laura and Gracie

Manual

KeyboardUsed to input data into the computer

Advantage• They are very common; all computers have one and they are easy to use.

Disadvantage• Easy to make mistakes if you can’t type quickly.Concept KeyboardA pictorial keyboard which you can press.

Advantage•Easy to use and waterproofDisadvantage•The screen can get dirty.•Might need to change the pictures if your stock changes

Mouse Enables you to control the movement of the on screen curser by moving it around a surface

AdvantageEasy to learn to useAccurate for selecting things

DisadvantageNeed a flat space next to the

computer.Tracker BallLike an upside down mouse, you turn it with your hand to move the pointer on the screen

Advantage•Ideal for using when flat space next to computer is limited

Disadvantage•Not supplied as standard.

JoystickSimilar to a tracker ball in operation except you have a stick which is moved rather than a rolling ball.

Advantage• Immediate feel of direction.

Disadvantage• Some people find them more difficult to use than mice.

Microphone

Used to input sound

Advantages Some systems can understand

most peoples voices with voice recognition software

Disadvantages Some systems need to be

trained to understand each different voice.

Digital CameraLooks very similar to a traditional camera.  However, unlike photographic cameras, digital cameras do not use film Advantage•No film needed.•Images can be digitally manipulatedDisadvantage•Need to print out photographsScannerAnother way in which we can capture still images or text to be stored and used on a computer.  Advantage•Can input things from paper documents•With OCR software, text can be scanned in Disadvantage•Images can take up a lot of memory space.

Graphics tablet Produces much more accurate drawings on the screen than a mouse or a pointing device could.

Advantage

Effective method of creating or changing diagrams and images.

Disadvantage

Only useful for inputting data about diagrams.

Can be very sensitive to movement and difficult to get used to using

Automatic

MICRStands for Magnetic Ink Character Recognition. Banks use them; the reader reads the numbers on a cheque.Advantage•Read at 100% accuracy..

Disadvantage•The reader and ink is expensiveOMR Stands for Optical Mark Reader. Reads pencil marks on a specially designed form or document, e.g. on a lottery ticket.

Advantage Fast and accurate way of

inputting information.

DisadvantageOnly works if the marks have

been made accurately and clearly.

OCR Stands for Optical Character Recognition. It enables the computer to identify written or printed characters which have been scanned in.

Advantage 95% accurate

DisadvantageNeeds careful checking as

letters can be misread.Barcode ReaderA bar code reader uses a visible red light to scan and read the barcode.  The reflected light is translated into digital data that is interpreted by the computer and the correct price and product information is displayed.

Advantage•Any price change only needs to be changed on the computer system, not on each item.

Magnetic Stripe Build into back of plastic cards, e.g. identity cards or credit cards. Holds information about the card owner.

AdvantageSimple to use and cheap to

produce.

DisadvantageLimited storage capacity – only

60 characters.SensorsSensors are used to detect physical quantities outside a computer such as temperature, pressure and light. 

To be able to process input from sensors a device called an analogue to digital converter must be connected between the computer and the sensors. This device converts signals from sensors into digital data that the computer can process