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Long Range Remote Control

Discussion in 'Electronic Basics' started by RobZ, May 3, 2007.

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  1. RobZ

    RobZ Guest

    Hi all,
    a friend has asked me for advice to remotely control access to his
    Farm.
    the Gate is 2km from the house, he wants video (gate -> house)
    intercom (bidirectional) and non-latching output to the electric gate
    motor circuitry
    the Gate motor is powered by 12V charged by Solar Cells

    possible solution i thought of was an embedded uPC running a web-cam
    and a form of VOIP for communications and the gate being driven from
    the uPC parallel port, all of this communicating to house via
    802.11(x).
    this will require the house side to be controled by either another uPC
    or a normal PC

    although this will work, does anyone out there have a better /
    simpler / off-the-shelf solution?
    thanks in advance
    Rob Zeilinga
     
  2. Tom Biasi

    Tom Biasi Guest

    Do you have line of sight to the house?
    Or perhaps a repeater. Its a long range link situation anyway.
     
  3. Yukio YANO

    Yukio YANO Guest

    Use Cell phone technology and Touchtone tech to send commands over the
    audio link. All available OFF the Shelf !
    Yukio YANO
     
  4. John

    John Guest

    There are TV cameras with built-in WiFi. Since this is a fixed
    installation, you could use directional antennas on each end (search
    wok + antenna on google) to get the required range. At 2km, this is
    probably a line-of-sight only solution.

    Is there an equivalent of the "citizens band" radio service in your
    country? If so, a unit mounted in a secure, weather-tight box and
    powered by the 12v used for the gate motor might work. You might want
    to add a "press to call" button that actually turns on the radio and
    starts a timer that will turn the radio off a minute or two after the
    last transmission to reduce the battery drain.

    You could add a tone detector to the audio output of the radio at the
    gate, so that a specific tone (or tone sequence) would activate a
    relay briefly to open/close the gate.

    John
     
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