Demystifying 4 pin RGB LEDS (Radio Shack 276-0028) using arduino

RGB LEDs are fairly useful in projects allowing for a wide range of color from a single unit.  However they can be a pain in the neck to work with and they too often come with little or no documentation.  I searched for some time to find a common resource on them and this Instructable is an attempt to pool the fruits of that search into one place. But first, a word about diodes.  What is a di ...

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