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Remote LEDs

Discussion in 'Electronic Basics' started by Dan Stephen, Oct 15, 2004.

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  1. Dan Stephen

    Dan Stephen Guest

    I have a client who would like me to design and build a gizmo the does the

    Two people roughly 5-6m apart.
    One person needs to signal the other person when a predetermined elapsed
    time is approaching. (switching on an orange LED) Then when the time has
    elapsed the person needs to turn on a flashing red LED.

    My thoughts so far:

    2 jiffy boxes.
    Box A - two switches, one for each LED
    Box B - two LEDs
    The boxes can not be joined together by wire.

    Within these constraints does anyone have a suggestion?
  2. CFoley1064

    CFoley1064 Guest

    Subject: Remote LEDs
    If this is a "one-off" application, the best way to go might be to go to the
    hardware store and get a couple of RC doorbells with built-in switches in the
    sender (mounting doorbell) for addressing. You can then take the two wires
    from the receiver electronics to the speaker, and full-wave rectify that to
    drive two transistors that drive two small dual coil latching relays, one for
    orange and one for red. You can have a button on the receiver side that
    energizes the reset coils, turning off the LEDs.

    This setup has the advantage of using replaceable parts, as well as simplicity.

    Good luck

    You can get similar modules at digikey.

    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
  4. Dan Stephen

    Dan Stephen Guest

    Thanks for the ideas, friends.

  5. Ive been fooling around with a ming xmitter receiver combo lately but
    after reading this I looked around on the net and found some pretty
    cheap wireless doorbells......ace hardware seems to sell one pretty
    cheap...10 bucks or so and Im sure you can find one of these or
    something similer in your area to play with. Im gonna go to ace and
    see if I can find one of their just to play the time you
    order ming components and pay shipping etc.... I think an existing
    item like a doorbell could be more easily and cheaply modified for a
    simple project.
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