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* Add backlight handling for lcd_pcf8574 Switch the backlight on or off by calling id(mydisplay).backlight() or id(mydisplay).no_backlight() in lamda functions (assuming mydisplay is the custom id for the LCD). * Use abstract method Co-authored-by: Attila Darazs <attila@darazs.com> Co-authored-by: Otto Winter <otto@otto-winter.com>