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Ideas for Lighting Automation

Discussion in 'Electronic Design' started by Edward Elhauge, Nov 10, 2005.

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  1. Hi,

    I'm hoping to get some leads on the types of components that might work
    to create an automation system for common incandescent building lights.
    A set of Googleable keywords would be enough, but more details would be

    What I'd like to do is put a relay on most of the lights in my home and
    control each relay from a low-cost computer running Linux. The other
    criteria is that the system be hard-wired (not be an X10 based system).

    So the components I would need are:

    Relays -- 100-500 watts,
    that have 0 or low draw when not energized,
    controllable via a hard wired interface,
    as inexpensive as possible,
    meets NEC

    IO interface -- control 20 relays or more,
    reasonably priced,
    isolated from relays (optically ?)

    I see a lot of X10 systems that can do this, but since this is going to
    be part of a security system, I'd like the control interface to be more
    secure than X10 allows.
  2. Fred Bloggs

    Fred Bloggs Guest

    These people rule:
  3. Konnex (KNX), LonWorks, INSTEON. Keyword is domotics.
  4. Guest

    2 ways to reduce relay power draw, if you want:

    1. reduce coil current to 60-70% after contacts closed.

    2. use bistable relay.

  5. Smack'n Rat

    Smack'n Rat Guest

    I took apart on of those indoor motion sensor lights that go in place of
    a light switch. The device wasn't very maker-friendly, but it wasn't a
    great challenge to take apart and look at the circuit or the devices in it.

    Anyhow, the they used a triac that was triggered by a PIR IC (on or
    off). The TRIAC was in a TO-220 Thermotab config with the tab screwed
    into the metal housing. Nice thing is that you should be able to use
    them to dim incadescents which was what I was trying to hack into it
    (abrupt on and off isn't very elegant).

    I guess a triac is technically a solid-state relay(?). Forgive me if I
    just stated the obvious or overlooked any industrial or safety issues
    you had in mind.

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