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This is my fourth instructable. It is on how you can make an alarm without any expensive equipment. It takes very short to set up too.

materials

wire
bar magnet(s)
reed switch
tape
paper
battery with holder
buzzer
door
Intruders:)





result
 

Step 1: Step one: battery

attach the battery/holder to the wall with tape (see pic) attach wires flowing downwards.
<p>Hey!! Thanks for this instructable! But i want this alarm system portable like we can pu t it in a purse or on a cycle. can you give me some idea about that? :)</p>
<p>thanks^^</p>
Hey, I have a question. In your picture the bar magnets were put on the door and get taped in it, so when the door open, the bar magnets get touch with reed switch or what? <br>Thank you. Sorry for my bad english
Cool. reed-switches are the best.
thanks

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Bio: [ALL INSTRUCTABLES MADE WHEN 12 YEARS OLD, DO NOT JUDGE, NEW ACCOUNT "Neon_Bible"] I love to play sports like basketball because Im a baller :). I ... More »
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