I don't understand why I need a resistor from an LED into ground if the LED is plugged into one of the pins. The Arduino is supplying power to the LED so surely it can withstand whatever the LED gives out when going into ground? Thanks in advance, ell.

Why Do I Need A Resistor

Forum 2005-2010 (read only) General Frequently-Asked Questions

leo_groeneveld December 11, 2010, 6:54pm 2

A led has a fixed pressure (voltage) drop. For the remaining voltage a resistor is used, if choosen correctly it restricts the current flowing through the led.

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Why Do I Need A Resistor

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