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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 ...
attach the battery/holder to the wall with tape (see pic) attach wires flowing downwards.
attach the reed switch to the hanging wire from the battery close but not touching the door
when a reed switch comes close to a magnet both parts attract causing them to come together and continue the flow of electricity. Attach the magnet with tape ...
add a wire flowing from the other side of the reed switch. This should then go to the buzzer. The attach an other wire flowing up (see red ...
attach the final two wires so that the circuit is complete now when the bar magnet comes close to the reed switch it will buzz. To make a ...
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