RGB (W) problems

Discussion in 'Homework Help' started by Kodak, May 15, 2015.

  1. Kodak

    Thread Starter New Member

    May 15, 2015
    2
    0
    Hi

    i have an RGB LED bur when it shuld be white it is Light Pink,
    each colour are running on a MOSFET.

    So i need a circuit that read out the value of what going in to my LED Colours
    And when all the colour are om "MAX" i want a fourth White LED to go ON

    Hope some one can help me.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
    744
    do you have a RGB led and it's not giving you the correct colours ,or do you need to know how to drive it?
     
  3. Kodak

    Thread Starter New Member

    May 15, 2015
    2
    0
    i have 3 LEDs (One Red, One Green, One Blue), and a controller that runs MOSFETs
    i need a circuit that turn ON a fourth LED (One White) if all af others LEDs MOSFET are ON ther highest power.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,980
    744
    ideally you need the circuit of the mosfets, but if you don't have it,you'll need a three input comparator circuit,to put the fouth led on.
     
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