Instructions

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Click on the serial monitor and add R , then the LED on the board will
light up and your PC will receive the information Hello World! from the
Arduino.
Lesson 2: Flashing LED
In the Hello World! program we have already encountered the LED. This
time we will connect an LED with one of the digital pins. The following
parts are needed:
Mega2560 board 1x
USB cable 1x
Red M5 LED 1x
220 Ω resistor 1x
Breadboard 1x
Jumper cable 2x