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

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

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Step 1: Step one: battery

attach the battery/holder to the wall with tape (see pic) attach wires flowing downwards.

K'nex gun builder says: Aug 19, 2011. 12:39 PM

Yeah, maybe I should stop pranking him. Before he pulls the ULTIMATE PRANK! (Nervous)

patriots8888 (author) in reply to K'nex gun builderAug 19, 2011. 1:43 PM

then you just have to top that prank!

K'nex gun builder says: Aug 18, 2011. 4:33 PM

Cool! I used it to prank again. I put it in my brothers bedroom and plugged it underneath his bed. When he went to bed I snuck in his room, and turned it on. Then I tried to hide when he heard the buzzer, and man he was so FREAKED OUT!

patriots8888 (author) in reply to K'nex gun builderAug 19, 2011. 8:57 AM

lol thats awesome