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  • Infra-Red
    • Remote controls
    • Short data links between PCs and mobile phones
    • Sensors
      • Burglar alarms
      • Security lights
    • Thermal Imaging
    • Infra-red sends waves to a sensor
      • When a button is pressed on a remote control it sends digital waves
        • If a different one is pressed it will send the same waves but in a different pattern
          • As it is digital, it is either sending a message or not


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