* `BACKLIGHT_BREATHING` if defined, enables backlight breathing. Note that this is only available if `BACKLIGHT_PIN` is B5, B6 or B7.
* `BREATHING_PERIOD 6` defines the length of one backlight "breath" in seconds.
* `BACKLIGHT_BREATHING` if defined, enables backlight breathing. Note that this is only available if `BACKLIGHT_PIN` is B5, B6 or B7.
* `BREATHING_PERIOD 6` defines the length of one backlight "breath" in seconds.