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Arduino RGB Common Anode LED Random Color Test. Source code in description.

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/* RGB LED with common Anode connected to permanent 5V pin.
* All three ground legs are connected through separate 10K Ohm resistor each
* which are then connected to analog pins used as grounds which we have, so to speak, open or close
* to the various extent by applying voltage back-pressure*/
Source code:
* All three ground legs are connected through separate 10K Ohm resistor each
* which are then connected to analog pins used as grounds which we have, so to speak, open or close
* to the various extent by applying voltage back-pressure*/
Source code: