Www. 1 - Input Devices_Section 2.1 - Input Devices

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This is a PDF to help IGCSE students to remember the advantages and disadvantages of output devices.

Transcript of Www. 1 - Input Devices_Section 2.1 - Input Devices

  • Section 2.1

    Input Devices

  • Key Words The following words will crop up as part of the following presentation.

    You should use your notes sheet to log information about them when it is covered. You will be quizzed on these words later.

    Manual Input Device Automatic Input Device Keyboards Numeric Keypad Pointing Devices Scanner Digital Camera Microphone Remote Control

    Joystick Touch Screen Web Cams Magnetic Stripe Reader Chip and Pin Reader Barcode Reader Magnetic Ink Character Recognition Optical Character Recognition Optical Mark Recognition

    NOTE: Sections of the presentation where you see the following symbol contains information about these keywords. This is your cue to make notes.


  • Input Devices


    Hardware devices that allow information to be input into a computer.


    NOTE: There are tons and tons of input devices. We will explore some of the more common examples.

    Two categories of Input Devices: 1. Manual Input Devices data entered by hand

    2. Automatic Input Devices data entered by a machine/computer

  • eos

    Examples of Manual Input Devices

    Keyboard Numeric Keypad Pointing Device Remote Control

    Joystick Touch Screen



    Digital Camera

    Graphics Tablet

    Webcams Light Pens

  • Manual Input Devices


  • Keyboards The most common type of input device. Key boards are used to input into the computer:

    Text Numbers Instructions

    Most keyboards use the QWERTY layout. The name comes from the keys on the top row which spell out QWERTY.

    QWERTY Keyboard


    Ergonomic keyboards have recently been developed. These are designed to reduce health problems linked with typing. The hand rest pictured on the keyboard above is standard on an ergonomic keyboard. For example Carpel Tunnel Syndrome and Repetitive Strain Injury (RSI).

  • Keyboards (Continued)

    Keyboards are used to input data into applications (For example text into Microsoft Word and numbers into a spreadsheet).

    They can also be used to input commands into the computer.

    For example Keyboard Shortcuts: CTRL + P to print CTRL + S to save Print Screen to take a screenshot of work



    Advantages Disadvantages

    Enable fast entry of new text into documents

    Users with arm/wrist problems can find keyboards hard to use

    Very easy to use Fairly large and take up desk space

    Information appears on the screen as it is typed so it is easy to verify (Check for correctness)

    Entering data can be slow when compared to direct data entry (Scanning a bank card for example)

  • Numeric Keypads

    Entering personal identification numbers (PIN) into an automatic teller machine (ATM).

    They can also be used to select how much money

    you would like to take out. Telephones have numeric keypads to allow phone

    numbers to be keyed in.



    Numeric Keypads are used for entering numbers. (Numeric means Number). Some also have functions to allow text entry.

  • Numeric Keypads (Continued)

    Electronic Point Of Sale (EPOS) terminals have numeric keypads in case the barcode reader fails to read the barcode and the number needs to be keyed in manually.

    Chip and PIN devices have numeric keypads to

    enter PIN numbers and amounts of money.



    Advantages Disadvantages

    Faster than standard keyboards for entry of numeric information

    Can be difficult to use due to small keys

    Usually small devices (Like Mobile Phones) and are easy to carry around

    Difficult (but not impossible) to enter text information

  • Pointing Devices eos

    Pointing devices are pieces of hardware that can be used to move and control a pointer (curser) on a screen. There are 3 main types of pointing device:

    Mice Touchpad Trackerballs


    Pointing Device (Like a mouse) used to move and control a Pointer (curser) around a screen.

  • Pointing Device 1 - Mice 2 types of mice are Ball and Optical. This allows the user to control the position of a pointer on a screen.


    A Ball mouse uses a ball underneath the mouse to detect movement. An Optical mouse uses reflected light rather than a ball.

    Ball detects movement

    Light detects movement

    Ball Mouse Optical Mouse

    An advantage Optical Mice is they have no moving parts and so pick up no dirt. Optical Mice are also often more precise than Ball Mice which makes them useful for fine movements of the pointer for tasks like graphic design.

  • Mice (Continued) eos

    Mice have 2 buttons and a scroll wheel with different functions: Left button used to select things Right button used to bring up a drop-down menu Scroll wheel helps you to move through a document

    Right Button

    Left Button

    Scroll Wheel

    Menu activated by right click

    Cordless Mice are exactly the same as regular mice apart from the fact that they do not need a wire connected to the computer. They are an example of a Wireless Device.

  • Mice (Continued)

    Can be used for Opening, Closing and Minimising programs and files etc.

    Can used for Grouping, Moving and Deleting files.

    Useful when Editing Images for example controlling Size and Position of an image.

    Can control the position of a pointer on the screen to allow you to select icons or scroll around the page.



    Advantages Disadvantages

    Faster to select an option compared to using a keyboard.

    People with poor hand movement or disabilities can find mice difficult

    Mice enable easy navigation around applications and Internet.

    Easily damaged and Ball Mice can pick up dirt and become clogged.

    Small and take up very little space. Hard to use without a flat surface.

  • Pointing Device 2 - Touchpad Used in many Laptop computers as a pointing device. Pointer in controlled by the user moving their finger on the touchpad to

    simulate the movements of a mouse.

    They also have buttons which have the same purpose as the left/right buttons on a mouse.


    Touchpad Left/Right Buttons

  • Touchpad (Continued)

    Touchpads have the same uses as a mouse.



    Advantages Disadvantages

    Faster to select an option compared to using a keyboard.

    People with poor hand movement or disabilities can find touchpads difficult.

    Touchpads enable easy navigation around applications and Internet.

    More difficult to control the pointer when compared with a mouse.

    Included in the laptop so no need for separate mouse. This helps improve portability.

    More difficult to perform operations such as drag and drop.

    Can be used even when there are no flat surfaces available.

    Dont get clogged with dirt as ball mice can.

  • Pointing Device 3 - Trackerball Similar to a mouse except that the ball is on the top of the device. Users control the pointers on the screen by rotating the ball with their


    Trackerballs usually have two buttons which have the same use as the right/left mouse buttons.

    Some have a third button which is the equivalent to double click.


    Trackerball Left/Right and Third Buttons

  • Trackerball (Continued)

    They have the same pointing/curser control as a mouse.

    Very comfortable to use even with people with hand/wrist disabilities.

    Can be faster to use than a mouse.



    Advantages Disadvantages

    People with limited hand/wrist movement find them easier to use.

    Trackerballs tend to be more expensive than mice.

    Pointer can be positioned more accurately on the screen than with a mouse.

    Can be quite tricky to get used to.

    Take up less desk space than a mouse as they do not need to be moved around.

  • Remote Controls These are used to control other devices using Infra Red Signals. Buttons on the keypad are used to select options. For example:

    Television Stations. Volume on an music player. Fast forwarding a DVD player.


    Buttons on Keypad

    Infra Red Signal

  • Remote Control (Continued)

    Most home entertainment systems use Remote Controls. For example: DVD players Hi-Fis Satellite Systems etc.

    Used in industry to remotely control machinery etc. Cranes for example

    can be remotely controlled.



    Advantages Disadvantages

    Enable devices to be operated from any distance. Useful for people with mobility disabilities.

    People with limited hand/wrist movement can find them difficult to use.

    Useful in chemical plants where equipment close to hazardous materials can be operated from a distance.

    Signal between the control and the device can be easily blocked.

  • Joysticks Perform similar functions to mice and trackerballs. Moving the stick controls the pointer on the screen and buttons are used

    to make selections.

    Most joysticks also have a button on the top of the stick that is used for gaming e.g. to fire a weapon.


    Control Buttons

    Fire button for Gaming

    Control Stick

  • Joysticks (Continued)

    Video games are often controlled by joysticks. They are used in simulators to mimic actual controls (Like flight