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Topic: LED current limiting resistor (Read 1 time) previous topic - next topic


I was thinking of using one of these:


in a project and I am a bit confused on the correct value resistor to use.  I am powering my project from a 3.7V LiPo battery and a 3.3V regulator.  Page 4 of the PDF linked above shows a forward voltage for the green LED of 3.2V and a forward current of 20mA.  I believe the formula to use would be (3.3 - 3.2)/.02A which would equal a resistor value of 5 Ohms.  This seems really small and I would like to verify that this is correct.  Any assistance would be great!  Thanks!
Arduino Uno;

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