Introduction: Door Alarm
This door alarm is a really cool way to know if some one has entered a/your room.
No more need to purchase a alarm!!! If someone opens the door when you're home, you will know
- Blue tape
- AA Battery
- AA Battery holder
- 2-inch strip of paper
Step 1: Mounting the Battery
First, Put the AA battery in its casing
Then, find a wall next to a door and tape the battery case about 1 centimeter away from the door.
Step 2: Attaching the Wire, and Mounting the Buzzer
First, twist wires on to the positive and negative sides of the casing (if there are no wires already there)
Second, tape the buzzer about one foot lower than the AA battery, and about 1 inch away from the wall, we will screw it in later
Step 3: Attaching the Wires and Taping Them Together
First, take the buzzers negative wire and and tape it to the AA battery cases negative wire, then take the buzzers positive wire and form an X shape, like in the picture (make sure a good amount of the buzzers positive wire is exposed).
Step 4: Attaching the Paper, and It's Wire
Take two one-inch pieces of tape and secure the strip of 2" paper. Bend the end so that it is at a 20˚ angle like in the picture
Step 5: Adding the Final Wire, Screwing in the Buzzer, and Final Adjustments
- Take some bendable wire and tape it to the AA battery case make sure you make it in a C shape, and that the end lands were the paper was bent.
- Take two screws and screw in the buzzer.
- Open the door and see if the bendable wires end (the one connected to the positive AA battery casing) lands on the buzzers open positive end. The result should be the buzzer going off.
If the wire doesn't stay on the buzzers positive wire bend it a little or adjust the tape, if it still doesn't work repeat.