where is led- connected to on your arduino. I see that you connected R/W to led-, when R/W should be connected to ground for writing. If you're powering the backlight off of a separate power supply, then rewire R/W to an arduino ground.
where is led- connected to on your arduino. I see that you connected R/W to led-, when R/W should be connected to ground for writing. If you're powering the backlight off of a separate power supply, then rewire R/W to an arduino ground.