Introduction: Presure Switch Alarm

Picture of Presure Switch Alarm

An alarm to keep intruders out for practicly no money! Very effective and scares intruders. Extremly easy, maybe to easy.

Step 1: Gather Your Things.

Picture of Gather Your Things.

Ok you will need:
One medium sized piece of cardboard-strong not flimsy.
An alarm or piezo or hor or somthing that makes loud noise.
One short piece of wire.
A battery OF THE CORRECT VOLTAGE I'm saying this because I used a nine volt and it blew out my alarm, make sure your alarm can handle your voltage.
Siccors and electricle tape or transparent tape will work fine.
And Alluminum foil.

Step 2: Folding the Cardboard

Picture of Folding the Cardboard

Thats it fold the cardboard in half.

Step 3: Cutting the Foil

Picture of Cutting the Foil

Cut the foil to the width of your cardboard.

Step 4: Tapeing

Picture of Tapeing

Now tape the foil to the edge of the folded cardboard. And push the wire of the battery holder through the foil and tape it in place.

Step 5: Tapeing the Other Side

Picture of Tapeing the Other Side

Now tape the other piece of foil to the other side of the cardboard. Then push the piece of wire through the foil and tape it in place.

Step 6: Attching the Alarm

Picture of Attching the Alarm

Now attatch the two extra wires, making sure positive and negative are correct, to the alarms battery terminals with tape. Pluug the battery in and turn on the alarm.

Step 7: Hide

Picture of Hide

Now put it under a light rug and be sure to have cardboard that doesn't fold all the way when the rug is on it. Now when someone steps on it the circuit will be completed and the alarm will go off.

This is my first instructable and I hope you liked it.


aloveeveryone (author)2011-06-08

nice one

pharoah (author)2007-04-12

The alarm he used is available at the dollar store BTW. Very loud, until you take it out of it's case. The plastic seems to amplify the sound.

actually what happens is, the plastic has a very firm grip on the speaker (which helps piezoelectric speakers to work better) and since it has such a good grip, most of the sound is picked up by the plastic, cause the case itself to make sound.

try taking it and pinching it with your fingers (the long way, not on the flat sides).

Also you can take the speaker and tape it to the bottom of a plastic cup to amplify the sound

Mr. Smart Kid (author)pharoah2007-04-12

i had one too

Colonel88 (author)2009-09-07

"Oh lookie here, who's battery is this? And oh, look i found another alarm. Back to looting" :D

willymakesstuff (author)2009-05-23

good idea

randofo (author)2007-04-12

Just for your information, technically speaking, a pressure switch usually refers to air pressure (and is pretty much useless for most applications). These things are generally referred to as floor switches or something of the sort. I have an industrial grade version of these floor switches that came my way when they "fell off the back of a truck" a while back. Essentially they follow the same principle as the one you have just built. I like the idea of using the cardboard as a hinge and also think this would benefit from using a plastic straw or two as spacers. Nice work.

one word. sponge.


ich bin ein pyro (author)2007-04-13

where can i buy siccors?

dude you are not funny

well its funnier than saying you spelled siccors wrong

true but still what r we 7

apparently, since you cant even spell "scissors" LOL (I'm just kidding, great instructable and I'm not insulting you)

robotix (author)ich bin ein pyro2007-04-13

Anywhere. Literaly.

judelizowski (author)2007-08-28

This is a Great instructable!!! i am going to make this right now....hehe

rocketbat (author)2007-04-12

i made one of these a wile back because our dog was sneaking into the living room to sleep on the new leather furniture! so i made something very similar to this and put it under a cussion then put a wire though the roof to a cheap and nasty digital doorbell. so later that night ...... DINGDONG...DINGDONG...DINGDONG... (NOISE DAD RUSHING DOWNSTEARS)...WHAT THE "%$£! Y DOIN ON THE CHAIR! (NOISE OF DOG MAKING A RUN FOR IT!) LOL

rocketbat (author)rocketbat2007-04-12


acaz93 (author)2007-04-12

or put 1 or 2 straws between cardboard as a spacer

WesDoesStuff (author)2007-04-12

it would be better if you had a peice of waxpaper with big holes in it tin between the two peices of foil as a spacer.

rimar2000 (author)2007-04-12

Good idea. Congratulations.

About This Instructable




Bio: I got a VEX robotics kit for christmass, even though it says "14" and older I practically mastered it and the programing kit I got ... More »
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