 your results
Sent in by:
Kimberly of Brooklyn, NY
Don't be alarmed when visitors BUZZ into your room.
- buzzers
- batteries
- cardboard
- wire
- aluminum foil
- paper
- magnets
- any other materials you can think of
- a door
- Check with a grown-up before you begin.
- Use whatever materials you can think of to build an alarm that will alert you when someone enters your room.
- Remember that an alarm is a special switch that is closed or opened by someone who doesn't know the switch is there. The alarm will sound when the circuit is completed.
- If your alarm doesn't work, try re-attaching the wires from the buzzer to the battery. The red wire needs to connect to the positive end of the battery and the black wire needs to connect to the negative end.
Once you get your alarm to work, let us know how you designed it. What makes it go off? How does the electrical current flow through it? Did you first try a design that didn't work? How did you change your design to make it work better?
Marissa, age 12 of NY wrote:
it was very loud so when I have a suprise for my sister in our room and I am not there I hear the alarm and got her.
Bradybill, age 14 of Las Vegas, NV wrote:
i had broke the switch so nothing worked, but I tried to fix it and to get it to work. I was tring to make a door alarm but my plans didnt work.
Mariah, age 15 wrote:
It rang loud! I was scared myself
Sydney, age 11 of Brampton, ON wrote:
Well it activated and now my brother cant sneak into my room without getting caught
Tate, age 8 of ME wrote:
well it worked and it was cool
Candela, age 11 of Orem, UT wrote:
It totally worked it was awesome
Jessica, age 13 of MI wrote:
we did it in class for a lab experiment. I was so amazed it worked it scared me when it went off.
Dyshiki, age 11 of Peoria, AZ wrote:
o my gosh this alarm is da best thing in the world like totally awsome I was in the kitchen eatn a tuna sandwich wen I heard da alarm go off it wa my annoying brother staeling my make up it reaally wrks o my gosh
Meaghan, age 11 of Kitchener, ON wrote:
i toddly choght my sister when she was trying to stell somthing from my bedroom and my alarm went on so I stoped her
Tasmia, age 11 of Portland, OR wrote:
Well, my older sister always used to come in and bother me... the first time she came in while the alarm was set... AHHHHH!!! She was gone in a second! I was really happy with the results.
Drake, age 13 of New York, NY wrote:
i changed the door alarm a bit. it took an old tv set and Vcr and hooked it up so every time someone comes into my room iit sounds like a minigun going off
James, age 10 of Labury, IL wrote:
i decided to change the design a bit and include a few laser tripwires and photo cells(CDS) and a mobile phone.. as soon as my little sister went into my room my phone started ringing and it came up on screen "room breich" XD
Emily, age 6 of NC wrote:
my dog was going to the door of my bedroom the alarm made him go away
Allison, age 7 of FL wrote:
My sister came in and set it off!!!
Mariah, age 7 of York wrote:
one day my sister wanted to steel a toy the bell was so loud my sister sreamed and ran away.
Onkita, age 9 of East Elmhurst, NY wrote:
it was so unbelievable when my little baby brother sneaked up to the room the alarm buzzed and it scared him.
Devon, age 12 of Chicago, IL wrote:
it sounded JUST like a doorbell placed in a house
Cass, age 8 of Elizabethton, TN wrote:
By keeping my sister out I put a alarm on my door.
Julia, age 9 of Ohsweken, ON wrote:
A can droped and caused it to make a noise.
Ashley, age 9 of Renton, WA wrote:
One night my sister opened the and the bell rang it scared her. It was funny.
Danielle, age 12 of Womelsdorf, PA wrote:
When I wound write in my dairy my mom alwas came in when I told her no. But now my mom heres the alarm and runs.
Sally, age 11 of Edmonton wrote:
When my sister opened the door it scared her because of the beep. It was funny.
Mark, age 13 of Colbert, WA wrote:
I made a more complicated circut and attached it to a wooden box I made in woodshop and when someone opens it the alarm goes off there and sends a LED siglal to me!
Michael, age 11 of Milton, FL wrote:
When I set up my door alarm I woke up in the middle of the night to find my cat getting scared of it.
Joanna, age 10 of Las Vegas wrote:
It worked great!
Jasmine, age 12 of Kansas City, MO wrote:
It worked great, my little brother tried to sneak in, but I caught him just in time because of the alarm.
Kyle, age 12 of Kansas City, MO wrote:
It didn't work! I made sure the right wires where on the right side of the battery.
Hamayal, age 9 of Toronto, ON wrote:
I opened the door and it started to beep, when ever some one goes in I can hear it from my backyard.
Ericka, age 8 of San Jose, CA wrote:
When I did my door alarm my sisters and brothers got scared by it so they never came back again.
Sierra, age 12 of Carson City, NV wrote:
I have a new idea for a door alarm. If you take a string put it over your door then have a bell conected to the other side. So when someone pulls the rope the bell will ring. If using this ida you will need to make some ajustments.
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