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A Simple Trip Wire

Make a trip wire that beeps when someone walks into it.

A Simple Trip Wire

With a few easy steps build a trip wire!

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Steps

Step #1:

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A Simple Trip Wire

Solder a wire to one terminal of a beeper or buzzer.

Step #2:

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A Simple Trip Wire
  • Put two pins or nails into a board.
  • Put in a third pin with a photo hook pivoting on it. Position the pin so that when the hook swings it will contact one of the other two pins.

Step #3:

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A Simple Trip Wire
  • Solder the wire from the beeper/buzzer to the pin that the hook will touch.
  • Solder a wire from a battery pack to the hook.

Step #4:

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A Simple Trip Wire

Complete the circuit by soldering a wire that connects the remaining terminals of the battery pack and the beeper/buzzer.

Step #5:

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A Simple Trip Wire
  • Tie a string to the hook. Mount the board on one side of a doorway or walkway and stretch the string across to the other side.
  • Now wait for someone to walk into your trap!

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