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How to NEATLY wire to LEDS

Discussion in 'Electronic Design' started by [email protected], Mar 24, 2007.

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  1. Guest

    I need to show 'time remaining' for an event, and would like to use a
    row of 10 LEDs to do so. All 10 would start out illuminated, and one
    LED after another will shut off as the time limit approaches. I'm
    using LEDs with a chrome bezel on them (can't resist the sci-fi look
    of those things), which will all be mounted in holes drilled in a
    piece of plexi. I'm looking for a 'clean' way to wire them all up to
    my microcontroller, which will be about 12" away. Like any LEDs, these
    just have two thin pieces of wire sticking out of the back. Do I have
    any options besides simply soldering stranded wire to them, and
    covering the splice with heat-shrink tubing? Is there some product or
    plug or component that will provide a less-cumbersome method of wiring
    these things up?

    Thanks
    --Alex
     
  2. Rich Grise

    Rich Grise Guest

    Sure. Mount them on a small PCB, with a header connector at one end,
    and connect to the uC board with ribbon cable, probably with IDC
    connectors.

    Or you could achieve the same thing by just taking 11 conductors of
    ribbon cable - you can get this from any ol' scrounged ribbon cable,
    and split it up and form it like this:


    bent ribbon wires bussed
    v v
    ,----------------------[LED]---+
    | ,--------------------[LED]---+
    | | ,------------------[LED]---+
    | | | ,----------------[LED]---+
    | | | | ,--------------[LED]---+
    | | | | | ,------------[LED]---+
    | | | | | | ,----------[LED]---+
    | | | | | | | ,--------[LED]---+
    | | | | | | | | ,------[LED]---+
    | | | | | | | | | ,----[LED]---+
    | | | | | | | | | | |
    | | | | | | | | | | |
    10 9 8 7 6 5 4 3 2 1 VCC

    active low

    You can just tin the stripped ends and wrap them 3/4 turn around the
    LED leads, like winding them around a post.

    Have Fun!
    Rich
     
  3. Robert Baer

    Robert Baer Guest

    One may be able to use an IDC connector; ribbon cable (to micro) on
    one end,and the LED leads plug into the openend?
     
  4. krw

    krw Guest

    You might be able to find an LED display already wired for you in a
    "thermometer" code, with a pretty bezel. Pass it four bits and it'll
    display the temperature bar. Try looking in RadioTrash or some such
    place.
     
  5. Genome

    Genome Guest

    That's an easy one......

    What you do is wire all your LEDs in series on a bit of Vero-Board, Bill
    will be along to give you the Farnell order number soon and you might be
    able to get one of those blue handled cutting tools as well.

    Then you get a bunch of (1N4148?) diodes and wire them in to tap at the
    juctions with the other ends going to the output of your CUK convertor......

    Then you connect the mosfet from your CUK converter to one of the outputs of
    your microcontroller and PWM it and you are good to go.

    You probably don't even need to bother with PID control.

    Simple really.

    DNA
     
  6. Brian

    Brian Guest

    What Keith really means is do it like he would:

    3 layer PCB
    Route it with 3 mil trace/space
    Be sure to use Microstrip

    Hahahahahahhahahahaa!
     
  7. jasen

    jasen Guest

    a terminal strip or circuitboard,
     
  8. Guest


    MTA-100 2 pin.

    http://rocky.digikey.com/WebLib/Amp/Web Photo/New Photos/640623-2, 3-640623-2.jpg
     
  9. Lionel

    Lionel Guest

    A chunk of Veroboard (strip board) & a ribbon cable connector is
    probably the tidiest way to do a small number of them without making
    up a custom PCB. I'd mount the bezels on the panel, clip in the LEDs,
    put a thick strip of cardboard between their legs (as a standoff),
    place the Veroboard, solder, then remove the cardboard &
    point-to-point wire links between the LED connections & the ribbon
    connector.
     
  10. Lionel

    Lionel Guest

    LOL. Cruel, but funny.

    (And notice how he ignored the OP's desire to use individual chrome
    bezels, which is obviously impossible with a bargraph module.)
     
  11. Lionel

    Lionel Guest

  12. One word - plasics.

    As in light pipes.
     
  13. Lionel

    Lionel Guest

    Lots of PC case makers use that method, & I've seen it result in
    shorts, because the legs extend so far out the back of the connector.
    Another problem is the connector vibrating/shaking off the pins, or
    being pulled off by the cables. All of these can be prevented by
    snipping most of the legs off from the rear of the connector & bending
    the stumps over by about a millimetre.
    That said, it's true that those problems are rare.
     
  14. Donald

    Donald Guest

    Why ?

    It will just extend out the back of the connector.

    No problem.

    donald
     
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