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Recent content by afink

  1. afink

    Can Phototransistor distinguish between colors?

    How much easer would it be if I only monitored the red LED and the sun was always behind or it was night?
  2. afink

    Can Phototransistor distinguish between colors?

    Can a circuit be designed using a Photodiode or Phototransistor to distinguish between the 3 different LED light sources (day and night) from a stoplight at a distance of 30 ft? The output would drive a relay for each color. I need to know when each color light turns on and off. This would be...
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