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The Effects of Directly Connecting an LED to an Arduino

What happens when you put an LED directly into a digital output of an Arduino and turn it on?

So all of the direct solutions drive too much current through the LED. Although the blue and violet LEDs don’t quite exceed the output pin limit, the others certainly do. Those old standby red & amber LEDs would have absurdly high intercepts, well beyond the limit of sanity, in the region where the data you see here breaks down, where the pin driver gives up and goes poof, not that that ever stopped anybody from trying.


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1 Comment

  1. And that is why it’s the first thing Massimo shows you to do with your new Arduino in _Getting_Started_with_Arduino_.

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