LED Basics: How to tell which lead is positive or negative | West Florida Components
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Chapter 1
Connecting LEDs
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LED Polarity - Blog | Switch Electronics
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OwlCircuits.com | LED Polarity Identification
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LED or Light Emitting Diode - Pin Diagram, Construction, Working Principle » ElectroDuino
LED tutorial: "shorter anode pin should be connected to positive". Eh?! WTF? - General Electronics - Arduino Forum
Connecting LEDs
Polarity - SparkFun Learn
