Input and Output Devices

Input and Output Devices

1. Manual Input Devices

   • Definiton
     • Data is input into the computer by hand (people have to do most of the work)
   • Examples:
     • Keyboard
     • Numeric Keypad
     • Joystick
     • Pointing Devices
     • Remote control
     • Scanner
     • Microphone
     • Web Camera
     • Digital Camera
     • Graphics Tablet

2. What are they?

   • Hardware devices that allow data to be entered into a computer

3. Where do they fit?

4. Direct input Devices

   • Definition
     • These devices require less human interaction in order to get data into a computer
   • Examples:
     • Magnetic Stripe Reader
     • Chip and PIN Reader
     • Optical Mark Reader (OMR)
     • Optical Character Reader (OCR)
     • Barcode Reader
     • Magnetic Ink Character Recognition (MICR)

5. Sensors

   • What are They?
     • Device which automatically inputs data into a computer system, where the data is constantly changing and can be measured.
   • What are they used for?
     • They are used to detect data in the surrounding environment that constantly changes.
       • Temperature
         • Measuring heat in a room
       • Light
         • Setting off a burglar alarm
       • Humidity
         • Detecting when plants become too dry
   • How does it work?
     • There are information in 'physical' and 'analouge'
       • Computers don't understand analogue data and therefore it needs to be converted to digital ( 1's , 0's)
         • A special device called an Analogue to Digital Converter (ADC) is used in order to achieve this.
   • Examples:
     • Temperature
     • Sound
     • Pressure
     • LIght
     • pH
     • Humidity/Moisture

6. Output Devices

   • Definition
     • Hardware devices that allow information to be sent out of a computer system.
   • Temporary output
     • e.g. A computer monitor produces images on the screen that constantly refresh and change
   • Permanent Output
     • e.g. A printer produces outputs as hard copies on paper (these cannot be changed once printed)
   • Examples:
     • CRT Monitor
     • TFT Monitor
     • Laser Printer
     • Plotter
     • Dot Matrix Printer
     • Speakers
     • Inkjet Printer
     • Multimedia Projector

7. Control Devices

   • Defintion
     • Output devices that work in conjunction with sensor input devices and commands from computers in order to control a process
   • Examples:
     • Motor
     • Buzzer
     • Heater
     • Light/Lamp

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