What wheel? The potentiometer on the backpack (the I2C expander board) is for contrast, not backlight. On many of the backpacks there is a jumper to enable or disable the backlight. Is that jumper in place?
What wheel? The potentiometer on the backpack (the I2C expander board) is for contrast, not backlight. On many of the backpacks there is a jumper to enable or disable the backlight. Is that jumper in place?