Apologizes for the very basic question. I am struggling to understand what kind of resistor to use for a specific LED. I have 10 blue LEDS and an arduino uno. The packaging on the led states, "3.0-3.3v @ 20mA". Possibly I am not understanding how to calculate this. I have been studying from this site. I tried to search the forums but I don't know if anyone has dared to ask a question as basic as this... XD
I want to blink this blue LED on a digital pin. Is this as simple as (5.0 - 3.3) / 0.02 = r ?