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home project (garage door open detector)

Discussion in 'Electronic Design' started by Mook Johnson, Aug 20, 2006.

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  1. Mook Johnson

    Mook Johnson Guest

    My garage door is constantly being left open but various unnamed members of
    the family. I'd like to design a wireless device that detects the door
    being open and lights an LED in the kitchen if the door is open and turns it
    off if it is closed.

    The garage is detached and about 30' from the house and there is a brick
    veneer wall on the outside of the house. The kitchen is on the other side
    of that wall.

    I'm thinking I can tap the state of the limit "closed" limit switch on the
    garage door and turn on the transmitter if the switch is open, turning on
    the LED in the kitchen.

    The logic parts will be fairly easy it is transmitter and reciever and
    associatd antennas. that will be tricky.

    Anyone have any ideas for a project like this.
     
  2. Jim Thompson

    Jim Thompson Guest

    Yep. Just buy it...

    http://www.1stdooropeners.com/garagedoormonitor.htm

    I bought mine at a better price, so surf a bit before you buy.

    ...Jim Thompson
     
  3. You could modify a wireless doorbell. Since you aren't touching the RF
    part, it might even be legal.
     
  4. Tim Auton

    Tim Auton Guest

    Well, Jim has already given you the best answer - buy one! At <$25
    you'll have a hard time just buying the required components for less. If
    however you still want to do it, for fun or learning, you can buy radio
    modules which will deal with the radio bit. I think I'm on the wrong
    side of the Atlantic to suggest suppliers local to you and Google only
    seems to want to give me local results, but this lot have a decent
    range, which should at least give you a flavour of the kind of things on
    the market:

    http://www.rfsolutions.co.uk/acatalog/index.html

    Search for 'radio modules', 'rf modules' and the like.

    If that's not enough fun and you still want to build something you need
    to read up on FCC regulations to see what you're allowed to build and
    operate without a license. Modules let you avoid both technical and
    legal obstacles. Radio HAMs would be the best source of information and
    advice if you want to get into building your own RF kit.


    Tim
     
  5. Tam/WB2TT

    Tam/WB2TT Guest

    I would look into using the AC line between the house and garage as a
    transmission line to carry a fairly low frequency carrier. Someplace around
    the low end of the AM band.

    Tam
     
  6. Mook Johnson

    Mook Johnson Guest

    Thanks

    I found it on ebay for $12...$16 shipped. Well that saved a lot of time. :)
     
  7. Mook Johnson

    Mook Johnson Guest

    now that is a interesting idea! Kinda like X10.
     
  8. default

    default Guest

    Piece of cake - buy one of those "remote finders" or "you've got
    mail"-in your rural mailbox, or wireless doorbells, and attach it to a
    tilt/mercury switch to transmit when the door is up.

    Or sound a horn that quickly conditions the offenders to close the
    door - with a 5 minute reset or something to keep you from going crazy
    too.
     
  9. Genome

    Genome Guest

    I suppose that's the end of the world as I know it.

    I don't suppose you could fill up lots of buckets of cold water and dump
    them in beds in the house and say.......

    'Whoops, Gosh..... sorry

    I FORGOT TO FLUSH THE TOILET AND COULDN'T BE BOTHERED TO WAIT FOR THE
    CISTERN TO FILL UP AGAIN SO I GOT THESE BUCKETS OF WATER TO DO THE JOB,
    BECAUSE IT'S REALLY EMBARRASING HAVING TURDS FLOATING IN THE TOILET, AND
    THEN I WASN'T ABLE TO WORK OUT WHAT TO DO WITH THEM SO IT SEEMED LIKE A GOOD
    IDEA TO TOSS THEM ON ABSORBANT MATERIAL BECAUSE LIKE I THOUGHT ABOUT WASHING
    THE GARAGE DOOR BUT WHEN I WENT DOWNSTAIRS IT WASN'T THERE'

    Are you a man or a mouse?

    DNA
     
  10. Genome

    Genome Guest

    Of course you might borrow a flame thrower from the local NRA then stand in
    the drive and totally torch the contents.

    You would need some old neighbor bloke standing by.......

    'Damn! I'm sure that wouldn't have happened if the door was closed.'

    'Dang tooting.'

    DNA
     
  11. Tam/WB2TT

    Tam/WB2TT Guest

    I thought this was a really great idea until I started thinking about it.
    The doorbell button sends a momentary signal. When do you send it? not when
    the door first opens. How about resetting it? I think the best bet is to
    forget about radio and use wire. Unless the ground is paved over, you can
    bury it a couple of inches.

    Tam
     
  12. What did you not understand about 'modify'?
     
  13. xray

    xray Guest

    Pretty sure the accepted phrase is, 'Darn tooting.'

    Is this another case of differences in phraseology between the US and GB
    like bonnet-hood or boot-trunk, or maybe some just kind of genomic
    irony?
     
  14. Genome is Australian, or so I believe. They do speak a sort of English,
    or claim to. But I suspect 'dang' is just a slip.
     
  15. Mook Johnson

    Mook Johnson Guest

    How ot you handle this response...."Whoopsie I forgot again!!!"

    Just keep beatin asses until they remember or CPS come to drag me off..which
    ever come first.

    I think I like my $16 solution.
     
  16. Mook Johnson

    Mook Johnson Guest

    Here in the south its

    Darn tootin'. :)
     
  17. Tam/WB2TT

    Tam/WB2TT Guest

    The guy could have buried 10 feet of wire in the time it took you to come up
    with this.

    Tam
     
  18. I wouldnt bother with designing this-- it's been done many times over.

    Try a few of these ideas on for size:

    Buy a remote thermometer. For $19.95 you get an indoor base station
    and two transmitters.

    Place one transmitter outdoors so you will get the outside temp. Take
    the other transmitter and put a "burglar" reed switch in series with
    one thermistor lead. Place the burglar sensor on your garage door.

    Then when your garage door is closed, you'll get the garage temperature
    reading. When it's open, you'll get a very high or low temp reading,
    or a line of dashes. Only glitch is it only updates every few minutes
    so its not the most timely of sensors.
     
  19. Don Bowey

    Don Bowey Guest

    Well, drat! Which is it?
     

  20. Well, he does love his lingerie.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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