[platformio] extra_configs = platformio_local*.ini [base] build_flags = -DCORE_DEBUG_LEVEL=0 -Os -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=1 [wifi] ; Override in platformio_local.ini — see platformio_local.ini.example build_flags = [env:esp32-s3-devkitc-1] platform = espressif32 board = esp32-s3-devkitc-1 framework = arduino board_build.arduino.memory_type = qio_opi ; Use octal PSRAM lib_deps = mathieucarbou/ESPAsyncWebServer @ ^3.6.0 bblanchon/ArduinoJson @ ^7.3.0 adafruit/Adafruit SSD1306 @ ^2.5.13 adafruit/Adafruit GFX Library @ ^1.11.11 monitor_speed = 115200 board_build.filesystem = littlefs build_flags = ${base.build_flags} ${wifi.build_flags}