The Arduino built-in LED
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Arduino Blink LED
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Graphical Programming Kit for Learn Coding with Arduino IDE1 – Blinking the On-board LED « osoyoo.com
The 'L' LED | Arduino Lesson 1. Blink | Adafruit Learning System
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BLINKING THE ONBOARD LED - Arduino tutorial #1 - YouTube
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5 different ways to Blink an LED using Arduino (+ Bonus)
