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it will work if you connect it like this: +5V | Resistor |MCU -----------<LED>-----+ | Resistor | GND
well the point i was trying to make is that digital output pins on a MCU only have two states, meaning your LED can only have two states . . . so no reason to have anything other than a two state LED . . . you will need an extra MCU pin to use all three states of a 2 color LED (color A, off, color B)
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