If you are familiar with Eclipse chime in with other capabilities in the comments. ... That means I’d expect a source code for ab Arduino project to be like 100 kB at most.

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.

Like in the Arduino IDE, PlatformIO allows you to either Build or Build and Upload your Arduino program to your board. In the blue bar under Visual Studio Code, you should see a check and arrow next ...

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.