L1: Turning on an LED - Physical Computing
Arduino Blinking LED - Inbuilt LED below Pin 13 - YouTube
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Arduino Uno: LED on pin 13 | Arduino, Programmeren, Projecten
File:Arduino IDE - Blink.png - Wikimedia Commons
Multiple Blinking LED on the Arduino : 4 Steps - Instructables
5 Blinking LEDs - Arduino Project Hub
L2: Blinking an LED - Physical Computing
Make a Simple LED Circuit - Arduino Project Hub
Arduino PWM Tutorial - Arduino Project Hub
Blinking LED with Arduino uno - Arduino Project Hub
The GeekDad Arduino Guide: Getting Blinky With It | WIRED
Arduino - LED - Blink | Arduino Tutorial
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Android Basics and User Interfaces
Code Improvement - LED blink (pin 13) - Programming Questions - Arduino Forum
File:Power and Pin13 LED on Arduino Compatible Board.jpg - Wikimedia Commons
Using an Arduino's Digital I/O
Arduino LED chaser freezes after a few loops? - Stack Overflow
Blink | Arduino Documentation | Arduino Documentation
Bad Tutorial? Connect an LED directly to pin 13 without resistor? - Website and Forum - Arduino Forum
Getting Started with the Arduino - Controlling the LED (Part 1)
