![]() the setup function runs once when you press reset or power the board In case you don´t have a LED you can use the built-in LED from the Arduino development board, just comments on the first line of the code below, inserting “//” before “#” and replacing LED with LED_BUILTIN throughout the code #define LED 7 Step 4: Then copy the code below to your Arduino IDE project and save it. Step 3: Select your COM Port “Tools -> Port->…”. Step 2: Select your board on “Tools -> Board -> Board Manager…”. ![]() If you don´t have it installed yet you can download the last version from here: If you don’t have these parts, you can also use the built-in LED of the Arduino board, which in this case is connected internally to the “D13” pin. Here we are using “D7” pin from Arduino Mega. In case you have the LED, the resistor and breadboard you can connect all together following the schematic below. I use pin 7 to connect LED, but you can use any of the digital pins. This tutorial uses a LED attached to an Arduino digital pin. 1x 330 ohm or 220 ohm resistor (optional).If you don’t have the optional parts written below, you can do this tutorial without them. In this tutorial, I am going to show you how to blink a LED using Arduino Mega 2560.
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