First, your schematic generate your problem.
You connect LCD display pins to serial ports pins, which is O.K. if you dont use Serial communication at all. You need to free pins 0,1 moving that connection to some other digital pins.
First, your schematic generate your problem.
You connect LCD display pins to serial ports pins, which is O.K. if you dont use Serial communication at all. You need to free pins 0,1 moving that connection to some other digital pins.