Make easy to change the default machine

platformio.ini

@@ -31,5 +31,11 @@ framework = arduino
 upload_speed = 512000
 board_build.partitions = min_spiffs.csv
 monitor_speed = 115200
-build_flags = -DCORE_DEBUG_LEVEL=0 -Wno-unused-variable -Wno-unused-function
-src_filter = +<*.h> +<*.s> +<*.S> +<*.cpp> +<*.c> +<*.ino> +<src/> -<.git/> -<data/> -<test/> -<tests/> -<Custom/>
+build_flags =
+	;-DMACHINE_FILENAME=test_drive.h ;Remove ";" from the beginning of this line and specify the machine file
+	-DCORE_DEBUG_LEVEL=0
+	-Wno-unused-variable
+	-Wno-unused-function
+src_filter =
+    +<*.h> +<*.s> +<*.S> +<*.cpp> +<*.c> +<*.ino> +<src/>
+    -<.git/> -<data/> -<test/> -<tests/> -<Custom/>