How to dim the backlight on an 20x4 LCD Display with the i2c connected to an Arduino uno?
I use the LiquidCrystal_I2C.h library and I can turn on and of the light with
lcd.backlight();
and
lcd.noBacklight();
But I don't want to turn off completely the backlight: I want to dim it.
Simple answer : You can't.
Complex Answer : You can use a BJT controlled by PWM to change/adapt the brightness.