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File:Arduino-LED-Pin13.jpg - Wikimedia Commons
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![First Sketch: Make an LED Blink - Environmental Monitoring with Arduino [Book]](https://www.oreilly.com/api/v2/epubs/9781449328603/files/httpatomoreillycomsourceoreillyimages971417.png "First Sketch: Make an LED Blink - Environmental Monitoring with Arduino [Book]")
First Sketch: Make an LED Blink - Environmental Monitoring with Arduino [Book]
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Arduino Blinking LED - Inbuilt LED below Pin 13 - YouTube
arduino - Pin 13: Do I need a Resistor? - Electrical Engineering Stack Exchange
