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Proximity sensor

Discussion in 'Beginner Electronics' started by gizmo98, Oct 2, 2003.

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  1. gizmo98

    gizmo98 Guest

    Dear net community,
    I would like to build a proximity sensor for a Motorhome that could trigger
    an alarm in various ways.
    What I want is to be able to set off an alarm inside the vehicle if it is
    approached during the night.
    PIRs wouldn't be any use because they may be set off by animals. What I was
    thinking of was something that would sense the presence of a body at about
    chest level, but not ground level, around the perimeter of the vehicle. If
    it were possible to switch this circuit so that at other times the alarm
    would be triggered if the door handles were operated that would be a bonus.
    The output of this would also need to be switchable between a small buzzer
    type of warning device and a loud siren depending on how the circuit was
    set. The working voltage would be 12v dc.

    I have to say now that my knowledge of electronics is basic although I do
    have experience. Any help with either a circuit diagram, suggestions as to
    how I might obtain one or any books that may be of help would be most
    welcome.

    Regards
    Steve
    England
     
  2. tim kettring

    tim kettring Guest

    You can also use black electricians tape on the inside bottom of a PIR
    , the pros do it all the time for pet-owners , it is called a "
    pet-alley "

    tim
     
  3. GMdude

    GMdude Guest

    Russell,

    That was an excellent suggestion (IR), but there is one factor that you
    might have missed,... Mother Nature. Not animals, but adverse weather
    conditions. I'm not an electronics tech., per say, but I'm familiar with
    this type of system.

    I'm an automotive tech that specializes in on-board computer
    diagnostics, and electronic problems.

    Let me explain. If a single water droplet gets on the lens of the
    emitter or reflector on our garage doors, the doors won't close. The beam
    has been broken (reflected elsewhere). I have to go and wipe them dry every
    time this happens.

    Even if you fabricated hoods for the emitter and reflector, a heavy rain
    passing through the beam, would cause a false trigger.

    GMdude

    P.S. I'm not knocking your suggestion. It was very good, but I think the IR
    stuff works better indoors.
     
  4. bj

    bj Guest

    HI RUSSELL
    Thanks for your input
    Its been 30 years or so since I studied/had anything to do with electronics
    but I'm using this IR project to get me back in the swing of things
    however I don't understand how your gararage doors have anything to do with
    my project.(emitter,reflector, garage door closing ???) I suspect your
    system is using some form of coded signals whereas I'm just trying to
    controll raw infra red
    PS if anyone knows of any groups dealing with playing about with underwater
    cameras please let me know

    BJ
     
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