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16  Forum 2005-2010 (read only) / Interfacing / Has pin 14 of the Arduino Uno a built-in resistor? on: November 29, 2010, 02:10:55 pm
I want too connect a external LED to my Arduino Uno. I heard that you need a resistor or you will blow your LED. I heard that that the Diecilima had a resistor on pin 14. Is also with the Uno. And could someone show me how I can connect a LED and a button to my Arduino (with Fritzing). And a LED and a LDR.

Sorry, I'm new with electronics  smiley-wink
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