How to Make a Door Alarm

Door Alarm:-

A homemade alarm might be just the thing to alert you when a nosy sibling is poking around. Even for general home protection, a homemade alarm can take burglars by surprise. Ready yourself for building and mounting your alarm by gathering your materials and preparing the base of the alarm. Build the alarm by wiring together a simple circuit for your buzzer. Install your alarm by attaching components to the board and setting up the pull-string that'll trip your alarm.

MATERIAL:-

1. 1.5 volt battery
2. 1.5 volt mini buzzer
3. Cardboard (like from a cereal box)
4. Electrical tape
5. Glue
6. Insulated wire (3 strands, small gauge)

METHOD:-

1. Tape the battery and buzzer onto your wooden board. Use electrical tape to attach these to the wood. The tape should not interfere with or cover any of the connections for the electrical circuit for the buzzer, nor should it cover the positive (+) or negative (-) ends of the battery.
2. Your buzzer may come with screw holes. For a sturdier alarm, you can screw your buzzer into the wood. Be careful to use short nails so these don't protrude through the board.
3. Wrap the stripped wire around the ends of the clothespin. Wrap one stripped end of two pieces of wire around frontmost divot of the top of the clip-end of the clothespin. Do the same to the bottom of the clip-end of the pin with a separate wire. Twist the stripped wires around the pin until they are tight.
4. When the pin closes, the wires should touch. This will complete the circuit that sets off your alarm.
5. Connect the bottom-pin wire to the battery. Position the wire so it is directly touching the positive (+) end of the battery. Use a piece of electrical tape to fasten the wire in place. If your battery is in a dock or cradle, attach the wire to the positive connector or wire for the cradle and tape it in place
6. Connect one non-battery wire to the buzzer. There should be a small opening in the buzzer where you can insert your wire. There should be two connectors, positive and negative. Touch one of your top clothespin wires directly to the positive input for the buzzer.
7. Alternatively, your buzzer may have wire leads coming off of it. Strip these, if necessary, and twist your non-battery wire to the positive buzzer wire.
8. Break the circuit with a piece of cardboard. Cut a medium sized piece of cardboard to insert between the wires wrapped around the clothespin. Insert the cardboard so that the wires on the clothespin do not touch when it is closed. This will stop the buzzer from going off.Any non-conductive material will work to break your circuit. Try small pieces of paper, wood, or rubber.
9. You may need to fold thin cardboard so there is more distance between wires. Very thin cardboard may not reliably keep the circuit broken.
10. Connect the remaining wires. Attach the stripped end of one of your remaining free clothespin wires to the negative (-) end of the battery. Fasten it with electrical tape. Then, in the same fashion as the first, attached the final clothespin wire to the negative (-) input for the buzzer.
11. After you finish attaching the wire to the buzzer, cover any remaining bare wires with tape. While the circuit is engaged, touching bare wire will result in a shock.
12. Be careful not to knock out the circuit breaker between the wires of your clothespin. Doing so will complete the circuit, and likely cause a small shock when you try to attach the wire to the buzzer.
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14. Test the switch by completing the circuit. Lay your alarm on a flat surface. Open the clothespin and remove the circuit breaker (piece of cardboard). When the clothespin closes, the circuit should complete and the buzzer turn on.
15. The ends of stripped wire on the clothespin should be in good contact. If they aren't or are just barely touching, wrap more wire around the clothespin.
16. When adjusting the clothespin wires, disengage your battery from the circuit to prevent getting shocked.