Help with multicoloured Leds

Discussion in 'The Projects Forum' started by Meesen, Dec 9, 2012.

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  1. Meesen

    Thread Starter New Member

    Dec 9, 2012
    6
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    Hi guys,

    New too the forum so please lend me a hand,

    I have a circuit out of a Holden commodore and am attempting too change the colour of the diodes,

    The Leds have four pins assuming they are tri colour or RGB,

    They have a common anode and all the cathode pins are connected together,

    At the moment it emits green but i am after blue, white and red,

    I assumed if it was a rgb led having all pins connected it would emit white

    Here is a photo:
    http://i1238.photobucket.com/albums/ff484/kudos_0743/IMAG1159.jpg

    any help would be great!
     
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    Your assumptions are incorrect. The LEDs you have are not RGB; they're single color. The four leads are there to help dissipate heat. An RGB would not be specified and then be connected in a manner which allows no independent control of the colors. Powering all three die on an RGB equally does not yield white, but usually a kind of pinkish color. To get white you have to power one die fully (usually green) then mix in a less than full power contribution of the other colors. This has to do with human vision and the chemical properties of the die.

    Given the existing board design, it would be very difficult to get three colors to emit from each of the four positions within the available space. It could be done, but would require expert board modification (new LEDs, trace cuts and jumpers) and a separate driver PCB.

    I just realized a Holden Commodore is a car. Automotive modifications are not allowed under the T.O.S. of this forum.
     
    Last edited: Dec 9, 2012
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

    http://forum.allaboutcircuits.com/showthread.php?t=54400

    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good luck.
     
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