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"Trip Wire"

Discussion in 'Electronic Basics' started by WilliamH, Jun 2, 2005.

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  1. WilliamH

    WilliamH Guest

    I want to make a flood light on the side of my house come on when
    circuit is broken.

    I want to attach a low voltage wire to something in my front yard
    When someone tries to remove that something from my yard (they'l
    have to cut the wire), I want my flood light be activated to scar
    them off. I can't imagine this is too difficult a job for someon
    that works in electronics. Can anyone tell me how to do this

    Thanks
    Willia
     
  2. Tom Biasi

    Tom Biasi Guest

    Hi William,
    As is often the case people here read into the question before they answer.
    I am no different. I could just describe a circuit to do what you ask but
    feel compelled to but in.
    If someone cuts the wire to steel your object the light will make them run
    alright, but with your object.
    Why not just let the PIR floodlights come on when they get near the object?
    OK TOM, mind your own business! Someone steeling your statues William?
    Regards,
    Tom
     
  3. arem_29

    arem_29 Guest

  4. Impmon

    Impmon Guest

    On Wed, 01 Jun 2005 19:28:33 -0500,
    The laziest way would be a long wire through all of the item to be
    protected and then wired to a relay coil. If the circuit is broken,
    the relay's coil would de-energize and the normally closed contact
    will close. The floodlight could be wired through the N.O. contact
    (in parallel to an existing switch) so the floodlights would come on
    when the wire's broken.
     
  5. Ban

    Ban Guest

    William, look at this beautiful "Garden Dwarf".
    http://www.classycollect.com/dw63177.html it has a motion detector built in
    and starts barking when someone comes near. If you wire the internal relay
    to the light line, also the light will go off. Good night.
     
  6. My first reaction was the same as Tom's: sounds like your alarm might
    be activated a tad to late! But maybe the protected object is heavy
    and/or bulky enough to make the burglar reluctant to hang around very
    long in bright illumination?

    Presumably though you have also considered inexpensive PIR-based
    security lights? A suitably located high power halogen lamp could be
    reliably triggered by a nearby potential villain. Most types are
    usually activated in darkness only, and for a presettable short
    duration, both features minimising wasted electricity consumption.

    But assuming you still want exactly what you've specified, a simple
    approach such as the one Impmon suggested would do the job. Its
    circuit could look like this:
    http://www.terrypin.dial.pipex.com/Images/TripAlarm.gif

    You could try it out initially with a battery (and a DC bulb for
    safety). But note my suggestion to use a mains-based DC supply ('wall
    wart'), as a battery would be constantly draining and therefore quite
    impractical.

    Note also my warning about mains voltages, as I don't know your skill
    level.

    BTW, if I was constructing this myself, I think I'd add a loud audible
    alarm in parallel with the outdoor lamp.
     
  7. John Smith

    John Smith Guest

    If I were doing it myself, I'd rig the circuit to trigger the Gattling gun.

    Actually, if I were doing it for real, I'd get a dog.
     
  8. WilliamH

    WilliamH Guest

    Tom Biasiwrote
    "WilliamH" <-spam.invalid
    wrote in
    Hi William
    As is often the case people here read into the question before the
    answer.
    I am no different. I could just describe a circuit to do what you as
    but
    feel compelled to but in
    If someone cuts the wire to steel your object the light will make the
    run
    alright, but with your object
    Why not just let the PIR floodlights come on when they get near th
    object
    OK TOM, mind your own business! Someone steeling your statue
    William
    Regards
    Tom[/quote:6719e5ad73

    Thanks for the response Tom

    Actually, someone is stealing solar lights from several of m
    neighbors. I only found this out after purchasing some reall
    expensive ones. I don't want mine to be taken. I'm actually going t
    anchor each light to the ground by a cable at the base of the ligh
    (the lights are on 18 inch metal poles) attached to a piece of reba
    driven into the ground. On a first attempt, this will probably kee
    the lights from being stolen. I'm sure they would bring wire cutter
    the next time though. I want to sound an alarm and or light as th
    light is pulled from the ground. I know this sounds elaborate, bu
    it's the principle at this point.

    Thansk
    Willia
     
  9. WilliamH

    WilliamH Guest

    WilliamHwrote
    I want to make a flood light on the side of my house come on when
    circuit is broken.
    When someone tries to remove that something from my yard (they'l
    have to cut the wire), I want my flood light be activated to scar
    them off. I can't imagine this is too difficult a job for someon
    that works in electronics. Can anyone tell me how to do this
    I just read through Tom's message and then went down to the rest o
    the responses. I thank each of you for your responses and will le
    you know how things go. I'm going to try an put something togethe
    this weekend. I just rememberd last evening, my neighbor across th
    steet has a degree in electronic engineering. He said he would hel
    me. He said he'd have a lot of fun doing it. I'll pass some of thes
    ideas by him as he said he'd think about it through the evening an
    get back with me. Thanks again for all of the responses. I trie
    posting this scenario on a couple of other forums and had very littl
    or no response.

    Willia
     
  10. WilliamH

    WilliamH Guest

    Terry Pinnellwrote
    -spam.invalid (WilliamH) wrote
    My first reaction was the same as Tom's: sounds like your alarm migh
    be activated a tad to late! But maybe the protected object is heav
    and/or bulky enough to make the burglar reluctant to hang around ver
    long in bright illumination

    Presumably though you have also considered inexpensive PIR-base
    security lights? A suitably located high power halogen lamp could b
    reliably triggered by a nearby potential villain. Most types ar
    usually activated in darkness only, and for a presettable shor
    duration, both features minimising wasted electricity consumption

    But assuming you still want exactly what you've specified, a simpl
    approach such as the one Impmon suggested would do the job. It
    circuit could look like this
    http://www.terrypin.dial.pipex.com/Images/TripAlarm.gi

    You could try it out initially with a battery (and a DC bulb fo
    safety). But note my suggestion to use a mains-based DC supply ('wal
    wart'), as a battery would be constantly draining and therefore quit
    impractical

    Note also my warning about mains voltages, as I don't know your skil
    level

    BTW, if I was constructing this myself, I think I'd add a lou
    audibl
    alarm in parallel with the outdoor lamp

    --
    Terry Pinnel
    Hobbyist, West Sussex, UK[/quote:e074f6c6d9

    Regarding the loud audible, I agree. I want to be sure to cover mysel
    during the day as well. My wife just had a digital camera taken fro
    her car in the late afternoon

    Willia
     
  11. Impmon

    Impmon Guest

    On Thu, 02 Jun 2005 11:28:22 -0500,
    Or junk the 12v light bulbs and go with 120v lightbulb and hook it
    directly to 120 ac outlet. If he cuts, police will then question him
    with badly singed hand in a nearby hospital. This one would be
    completely foolproof if it wasn't for the fact USA is lawsuit happy
    country. =P
     
  12. ?? Is this a reply to my post? Or a copy of it...?
     
  13. William: I think there's something screwed up with your methods of
    quoting...
     
  14. WilliamH

    WilliamH Guest

    Banwrote
    WilliamH wrote
    William, look at this beautiful "Garden Dwarf".
    http://www.classycollect.com/dw63177.html it has a motion detecto
    built in
    and starts barking when someone comes near. If you wire the interna
    relay
    to the light line, also the light will go off. Good night
    --
    ciao Ba
    Bordighera, Italy[/quote:97bab28074

    That's a good idea..

    Willia
     
  15. Guest

    The only suggestion I have to offer is to add a camera (preferably
    video) to the mix. If the light/sound show does not deter the theft,
    the camera can provide some info on the perp. You probably don't want
    the camera in line with light from either direction, one would get the
    perp running away, the other would get you a backlit silouhette. An
    oblique angle that covers some of the street would be best.

    Good Luck,
    Tim
     

  16. That's a great way to end up in prision for setting a booby trap.
    What about kids or animals that could get hurt or killed, too?
     
  17. WilliamH

    WilliamH Guest

    My apologies. It was kind of confusing to me as well when I wa
    posting. I'm sure it was/is confusing to everyone else. I think I'v
    figured it out now
     
  18. OK, no big deal!

    Another puzzle. Not sure whether it's just some quirk with my Agent
    newsreader, or something you did when sending, but your message was
    neatly placed in the original thread, "Trip Wire", yet I see its
    Subject is not 'Re: "Trip Wire" as I'd have expected, but 'You're
    Correct Terry (screwed up methods of quoting)'
     
  19. Rich Grise

    Rich Grise Guest

    I've come to the thread a little late, but I'm still not happy -
    If a $15.00 motion-detector security light doesn't deter the thief
    as he's walking up onto the property, why would a light that doesn't
    come on until he's already cut the trip wire scare him away?

    Thanks,
    Rich
     
  20. Agreed - I asked same question in my reply yesterday. No response yet.
     
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