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Blink Arduino
Lesson 1 Blinking LED — SunFounder uno-and-mega-kit documentation
c++ - Tinkercad Circuit: How to Make the Built-in LED and LED light up through a push button - Stack Overflow
Getting Started with the Arduino - Controlling the LED (Part 1)
How to Wire and Program a Button
LED BLINKING USING ARDUINO NANO - Instructables
The Arduino built-in LED
L1: Turning on an LED - Physical Computing
L2: Blinking an LED - Physical Computing