DIY: Alarm Circuits
Most alarm systems consist of one of two different types of models: closed circuit or open circuit. Closed circuit alarms have a constant flow of electricity. Once this circuit is broken, electricity shuts off and automatically turns on the alarm. The open circuit alarm does not have electricity until a trigger has been activated. Once activated, the circuit is complete and the alarm will sound. You can build your own alarm system to protect your home. Does this Spark an idea?
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Things You'll Need
- One piece of cardboard, about 4 inches by 12 inches
- Aluminum foil
- Four pieces of insulated wire
- Electrical tape
- Nine-volt battery
- Buzzer
- Rug
Instructions
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1
Fold the piece of cardboard in half. Wrap aluminum foil around the two ends that touch.
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2
Remove the ends off of your insulated wire. The metal should be visible.
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3
Attach the end of one wire with one side of the aluminum foil using your electrical tape. Repeat the process with another wire on the other side of the aluminum foil.
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4
Connect the positive end of the nine-volt battery with the positive end of your buzzer with one piece of insulated wire.
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5
Connect the wire on one side of the aluminum foil to the negative end of the battery. Connect the other wire to the other side to the negative end of the buzzer.
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6
Place your piece of cardboard underneath a rug in front of the door. Be certain the rug is light enough to keep the two sides of the aluminum foil from touching. Once the rug is stepped on, the buzzer will sound.
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References
Resources
- Photo Credit inside the alarm box. image by Kevin Chesson from Fotolia.com
Comments
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That's great but why we cannot add some bridges instead of dayouts.
