Colour sensing

Discussion in 'The Projects Forum' started by Baqir Malik, Feb 11, 2011.

  1. Baqir Malik

    Thread Starter New Member

    Feb 11, 2011
    I have a project of differentiating between the colors. I have previously used white led with a ldr and red filter...It is working fine but i was just wondering if there is a better way to go about it...
    p.s. i do not want to spend too much money and buy those rbg sensors...
  2. jpanhalt


    Jan 18, 2008
    How fine of color differences do you need to distinguish between?

    If you look at the emission and absorption curves for your source and filter(s), you can get a good feel for what colors you can distinguish. You may not be able to say what color something is, but you will be able to distinguish it from many other colors using a simple system like you describe.

    You may want to read more about isosbestic points.