Visual Studio Code + PlatformIO Default platform setup: Arduino Nano - Mega 328
Code is inside src/main.cpp
pio run -e nanoatmega328 -t upload
pio run -e nanoatmega328 -t monitor
pio run -e nanoatmega328 -t upload
pio run -e nanoatmega328 -t monitor
Compiled binaries are placed in builds/ directory.