c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Arduino",
            "includePath": [
                "${workspaceFolder}/**",
                "C:/Users/${env:USERNAME}/AppData/Local/Arduino15/packages/arduino/hardware/avr/1.8.6/cores/arduino",
                "C:/Users/${env:USERNAME}/AppData/Local/Arduino15/packages/arduino/tools/**",
                "C:/Program Files (x86)/Arduino/hardware/arduino/avr/cores/arduino",
                "C:/Program Files (x86)/Arduino/hardware/tools/avr/avr/include"
            ],
            "defines": [
                "ARDUINO=100",
                "USBCON"
            ],
            "intelliSenseMode": "gcc-x64",
            "compilerPath": "C:/Program Files (x86)/Arduino/hardware/tools/avr/bin/avr-gcc.exe",
            "cStandard": "c11",
            "cppStandard": "c++11"
        }
    ],
    "version": 4
}