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powerline communications

Discussion in 'Electronic Basics' started by Neil, Jan 13, 2007.

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  1. Neil

    Neil Guest

    I am seeking help in understanding what powerline communications or
    Homeplug devices might be available to help me with a small project. I
    need run between 25 to 35 monitors from a server(s). The monitors
    will be located between 50 to 400 ft from the server(s). I want to use
    the existing electrical infrastructure. low speed is OK. Can this be
    done? are there devices on the market that can be used?

  2. Lord Garth

    Lord Garth Guest

    It would be helpful if you explained your application and perhaps what
    video standard you are trying to send.
  3. Don Bowey

    Don Bowey Guest

  4. Neil

    Neil Guest

    Yes, that would probably help. This is a prototype effort in, what
    will hopefully become a commercial application. The monitors will be
    in various locations throughout a
    building and will display text messages only. Cost is a prime
    consideration. In the proof of concept I will use LCD monitors, but I
    am looking at various technologies including flexible displays on
    plastic, e-ink and segmented ePaper displays.
  5. Lord Garth

    Lord Garth Guest

    Since you want to use LCD monitors, I'll assume you are not sending
    composite video.
    You can do much if you use a small diskless, fanless computer board that
    runs a small
    application to suit your purpose. Something in the PC104 form factor would
    be quite
    capable. You can then transmit your text via standard ethernet means.
  6. In that case there are off the shelf LED displays that should work well. You
    could send out a line of txt and let the display scroll it.

  7. Gareth

    Gareth Guest

    I think the the best way to proceed would be to work out what data rate
    you require. In other words, how many characters will you need to
    transmit in total per second (one character = 1 byte). Then look at the
    data rate you can get with available devices.

    Have a look at:

    Are all the monitors displaying the same message or different messages?
    If they are displaying different messages?

  8. Neil

    Neil Guest

    They will be displaying different messages. Using the existing
    electrical infrastructure to deliver the text message to the screen
    will make this project a much higher probability of getting of the
    ground. I've looked at web sites recommended and am trying to get a
    better understanding things like powerline router and powerline bridge.
    Telkonet looks very close. I am still looking at Dallas semiconductor.
  9. jasen

    jasen Guest

    text only... that makes a big difference. you could probably get by withe
    anything that can send a reasonably fast serial signal down the powerline

    for proof of concept you could try hooking a phone extender to pair of POTS
    modems and put a small pc begind the monitor. run the modems half-duplex.

    for production possibly flatscreen TV (or security?) monitors be modified
    by adding a teletext chip, microcontroller and a custom modem...

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