Michael Beyhs shows us how to use an LED as a sensor:
How the code works:
- Configure all analog inputs to outputs and pull low to turn on all red LEDs.
- Turn one analog input pin into an actual Input and read the amount of light that is reflected into it.
- Turn that input back into an output and continue on to next.
- After all inputs have been read adjust the PWM of the blue LEDs according to the amount of light that was measured.
- loop forever…
Via Hacked Gadgets.