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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.

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LED burned on Arduino

I connected a green LED to pin 13 and digital GND on Arduino Uno R3. pinMode was set to OUTPUT and digitalwrite was set toHIGH. The LED glowed normally. … However connecting same LED to the 5V and GND burnt it out. How? Did not pin 13 on HIGH also have voltage of +5V ? …