Input/output Device Functions

Input/output Device Functions

1. Touch Screen

   • Input/Output
   • used widely on mobile phones, tablets, PC'S and interactive whiteboards.
     • Used as an input by tapping the screen. Used as an outout by viewing the display.

2. Keyboard

   • Input
   • Commonly used data entry method. user presses a key and the code is entered into the computer

3. Pointing devices. Mouse.

   • Input
   • touch pads and trackballs are also types of pointing devices.

4. Microphone

   • Input
   • used in input sound into the computer system, used in voice recognition software.

5. Barcode Scanner

   • Input
   • used to input data automatically from barcodes. Barcode reader scans the barcodes using visible red light, which is then used to identify the details of the product.

6. Joystick/games controller

   • Input
   • used to play computer games by controlling the way something moves on the screen. can also be used to controller wheelchairs.

7. Webcam

   • Input
   • Digital images captured and input into the system for use in the on-screen display or videoconferencing

8. Sensors

   • Input
   • Used to detect physical variables for input into the computer control system, such as temperature, light or pressure.

9. Flat-screen monitor

   • Output
   • Used to display the output from a computer system.
     • They take up less space and emit less heat than the CRT screens they have replaced.

10. Speakers

    • Output
    • Use internal sound card to create high quality audio to be output through externally connected speakers.

11. Inkjet Printer

    • Output
    • colour inkjet printers are smaller than laser printers and produce a higher quality output.
      • Normally used in home environments, so noise, and speed aren't such a problem.

12. Laser Printer

    • Output
    • Large printers used at home or for businesses. operate quietly, with large number of high quality sheets very quickly. operate in a similar way to photocopiers, where the toner is fused on to paper by heat and pressure.

13. LED Lights

    • Output
    • Often used as output indicators from a control system.

14. Actuator

    • Output
    • Used as outputs from a control system. eg , it contains a motor and linkage to lift a carpark barrier.

15. Speciality devices

    • Many assistive technology devices are available to provide access for disabled users.
      • Output - Braille for the blind or the partially sighted Input - 'eye-tracking controllers', foot operating mouse, sip-and-puff switches

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