A Simple Trip Wire

User-Contributed Project

User-Contributed Project

This project guide is not managed by MAKE staff.

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

  • Author: Lewis
  • Time required: 15 to 30 Mins
  • Difficulty: Easy
  • Add Note x

With a few easy steps build a trip wire!

Tools
Relevant parts
Relevant parts (continued)
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Add Note Edit Step 1 — A Simple Trip Wire  ¶ 

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

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Add Note Edit Step 2  ¶ 

  • 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.

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Add Note Edit Step 3  ¶ 

  • 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.

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Add Note Edit Step 4  ¶ 

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

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Add Note Edit Step 5  ¶ 

  • 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!

For more information, check out the Circuits category page.

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