No i didnt use potentiometer. I wired like this:
LCD pin 1 (VSS) -> Arduion pin GND
LCD pin 2 (VDD) -> Arduion pin +5V
LCD pin 3 (VO) -> Arduion pin GND throo 270ohm resistor
LCD pin 4 (RS) -> Arduion pin 12
LCD pin 5 (RW) -> Arduion pin 11
LCD pin 6 (E) -> Arduion pin 10
LCD pin 11 (D4) -> Arduion pin 5
LCD pin 12 (D5) -> Arduion pin 4
LCD pin 13 (D6) -> Arduion pin 3
LCD pin 14 (D7) -> Arduion pin 2
LCD pin 15 (A) -> Arduion pin +5V throo 270ohm resistor
LCD pin 16 (K) -> Arduion pin GND