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Proximity sensor

Discussion in 'Electronic Basics' started by gizmo98, Oct 2, 2003.

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  1. gizmo98

    gizmo98 Guest

    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. Baphomet

    Baphomet Guest

    See if this has applicability for your needs
    http://www.schematicsforfree.com/misc_circuits/Alarm_-_Universal_System.pdf
     
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