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Picture of How to make a cheap, simple, and effective alarm system
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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

Picture of Step one: battery
attach the battery/holder to the wall with tape (see pic) attach wires flowing downwards.
 
abagas1 year ago
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?
Thank you. Sorry for my bad english
jensenr304 years ago
Cool. reed-switches are the best.
patriots8888 (author)  jensenr304 years ago
thanks