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simple RGB indicator 2

uses : green to red indicator for fuel tanks , batteries , generators , overheat.. it has many uses by itself

This microcontroller firstly takes the connected value and saves it as the max value (MAX).
whenever it goes lower than the MAX, the RGB light turns more and more to red depending on how far it is from MAX.
if the connected value goes over MAX, it instantly becomes the new MAX and triggers an ON signal.
the RGB effect is directly calculated from the MAX to 0.