How to go about making a circuit that detects colour change?

Discussion in 'The Projects Forum' started by brent-meister, Nov 16, 2015.

  1. brent-meister

    Thread Starter New Member

    Nov 16, 2015
    3
    0
    Hi guys very new to electronics. I want to able to indicate a change in color digitally. For example a red that turns into a darker red an LED would light up and indicate the colour change. What sort of sensor can do this and where do I start.

    Thanks a bunch guys!
     
  2. OBW0549

    Well-Known Member

    Mar 2, 2015
    1,310
    885
    There's a chip for that. Adafruit has a breakout board using that device, and a tutorial on how to use it.
     
  3. BReeves

    Member

    Nov 24, 2012
    412
    64
    That's a pretty cool chip, I would have used a USB camera and software but you have a better answer.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    An old-school solution would simply be a light detector with a filter in front of it, with the appropriate absorption spectrum to discriminate the two colors. I think there is a medical tool like this, that distinguishes arterial blood from venous blood, or something like that.
     
  5. MrSoftware

    Active Member

    Oct 29, 2013
    501
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