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This is an infrared alarm system

  • 2014-03-05
  • 1.05MB
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This is an infrared alarm system. The system uses 555 to modulate a red light-emitting tube to emit a 38KHZ infrared signal. An infrared receiver is used on the opposite side to receive the signal to detect whether someone passes by. If so, an audible and visual alarm is sounded.

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