arduino - Pin 13: Do I need a Resistor? - Electrical Engineering Stack Exchange
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How a Sketch Makes the LED Turn On and Off | LEARN.PARALLAX.COM
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Bad Tutorial? Connect an LED directly to pin 13 without resistor? - Website and Forum - Arduino Forum
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The Arduino built-in LED
File:Power and Pin13 LED on Arduino Compatible Board.jpg - Wikipedia
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L2: Blinking an LED - Physical Computing
Getting Started with the Arduino - Controlling the LED (Part 1)
Blink an LED With Digital Output : 6 Steps - Instructables
Arduino LED - Complete Tutorial - The Robotics Back-End
2.1: Power LED (Red) and Integrated LED on Line 13 (Green) on Arduino... | Download Scientific Diagram
Blink Without Delay | Arduino
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Arduino LED - Complete Tutorial - The Robotics Back-End
L1: Turning on an LED - Physical Computing
Arduino Blinking LED - Inbuilt LED below Pin 13 - YouTube
Arduino Uno: LED on pin 13 | Arduino, Arduino projects, Arduino led
Blinking an LED with Delay - Arduino Basics | Homemade Circuit Projects
Arduino uno led pin 13 blinking on and off with delay - YouTube
The GeekDad Arduino Guide: Getting Blinky With It | WIRED
Arduino Tutorial - Lesson 3 - Breadboards and LEDs
