Portable Tripwire




About: I play a lot of minecraft and like to work with LED's and some circuitry, but most of all I love to cook and BBQ.

This Instructable is for you low tech people like me

Update: I recreated the pictures on google sketchup:)

Step 1: Parts

The Parts:
1 altoids tin
1 switch of some sort
1 "d" battery with holder (radioshack)
1 buzzer
half a popcicle stick
aluminum foil\
clear fish wire
match stick or any non metal thin stick

Step 2: Cutting

Cut a rectangle big enough for the D battery holder and two smaller one on the side for the buzzer and the switch.

Step 3: Wireing

Connect the buzzer to the switch and connect that to the battery holder Do not connect the wires from the buzzer to the battery holder

If your good with a solder then I recommend that

Step 4: Add Together

place the switch, the battery holder and the buzzerinto the altiods tin.

Have the two remaining wires stick out. see pic.

Step 5: Buzzer Base

tape one wire to the side of the altiods tin and tape the foil on top. see pic.

Step 6: Tripwire Activator

tape other wire to popcicle stick and tape the foil to it( the wire must touch the foil)

Step 7: Tape All Together

tape the popcicle stick to the tin till its hard to pull up
Or wrap a rubber band around the device and the popsicle stick

Step 8: Your Done!!!!

your finished with your E-Z tripwire, just tape a matchstick to sum fishing line and tape the other end to the wall. put som tacky on the bottum of your tripwire to have it stick to walls.

Step 9: Can You See It?

Can you see it???



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    19 Discussions


    8 years ago on Introduction

    why not a AA battery? wouldn't that involve cutting the tin less? if you could get away with the only holes in it being for the tripwire and vents for the sound to escape you could hide it in plain view and no one would assume it was a tripwire :D

    i can see it but it isnt clarly visible ... the buzzer would be more useful in a remote local, say your room as to not alert the other person you are on to them

    1 reply

    9 years ago on Introduction

    ehhhhhh... looks badly done, could use soldering instead of tape.


    9 years ago on Introduction

    i think the dangerous book for boys idea was better. It was more simple. like you know covering the ends of a clothespin with foil. or the pressure pad that was in there.


    9 years ago on Step 9

    Look on the right side towards the top.


    9 years ago on Introduction

    if you added a DPDT relay wired so that once activated it stayed on, the buzzer would keep buzzing once tripped

    1 reply

    9 years ago on Introduction

    pretty sick, i like how its in an altoids can too, haha. and to the people saying they could see it: it is because it is a direct picture of it, if you were on the other side of the door, walking to go get yourself a poptart, i dont think you would see that.


    9 years ago on Step 8

    Nice, but you should be more clear on how to set it up. I think that the matchstick goes between the two pieces of foil, but you should explain.


    9 years ago on Introduction

    yeah, i get it now, but its a bit hard to understand. Did you try using maybe a rubber band instead of tape? For a heavier duty simple switch like this you can also try using one of those clips for hanging up clothing.


    9 years ago on Introduction

    well that was very nice and i can see you trip wire about 2ish feet up


    9 years ago on Step 1

    Looks like an interesting device, but I'm very unclear about how the trip switch is assembled, how it functions, where it makes contact, etc. Better photos are a must. Also I think you mean Popsicle stick, not toothpick.

    1 reply