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.

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 holder FOR THE CORRECT VOLATGE
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.

Comments

[aloveeveryone]

nice one

[pharoah]

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.

[James (pseudo-geek)]

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.

[James (pseudo-geek)]

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

[FireDragon]

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

[Mr. Smart Kid]

i had one too

[Colonel88]

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

[willymakesstuff]

good idea

[randofo]

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.

[James (pseudo-geek)]

one word. sponge.

[raykholo]

how?

[ich bin ein pyro]

where can i buy siccors?

[runingfromtheman]

dude you are not funny

[ich bin ein pyro]

well its funnier than saying you spelled siccors wrong

[runingfromtheman]

true but still what r we 7

[James (pseudo-geek)]

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

[robotix]

Anywhere. Literaly.

[judelizowski]

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

[rocketbat]

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]

FORGOT TO SAY, GREAT INSTRUCTABLE!

[acaz93]

or put 1 or 2 straws between cardboard as a spacer

[Shark500]

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]

Good idea. Congratulations.