On the other hand, the Arduino IDE only lets you program Arduino boards with the Arduino programming language, which is based on C++. With that over, let’s make the Arduino blink its internal LED!

Open the Arduino software and paste the Arduino code (the text in the box near the bottom of the post) into a new sketch. Click Sketch > Verify / Compile to make sure the code is properly in there.

4. Write Your Arduino Code. Write your Arduino code in the file created by PlatformIO. The .ino files in the Arduino IDE can be found in the src folder in your project folder. 5. Build and Upload.