I bought the arduino starter pack, and found that the blue led requires more resistors than the green led does or it blows fairly quickly. The starter pack didn't give any heads up about this. All it says on the Kit Contents paper is that the led's are 3mm which is misleading because it gives the im…

Which resistor to use for blue led

MarkT January 6, 2015, 5:33pm 4

You need to know 3 things - the rated current for the LED, I, the forward voltage, Vf, and your
supply voltage, Vs

R = (Vs - Vf) / I

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