I2C Serial Interface to drive 1602 and similar Hitachi controller-based LCDs.Simply solder it to the back of your LCD and apply 4 wires.I2C Address of 0x20.Initailize using LiquidCrystal library:LiquidCrystal_I2C lcd(0x20, 4, 5, 6, 0, 1, 2, 3, 7, NEGATIVE);Pin configuration: MjkdzI2C address 0x20RS P6RW P5E P4D4 P0D5 P1D6 P2D7 P3Backlight P7Bl Polarity NEGATIVE