Arduino LCD1602 character LCD expansion board , PCB Immersion Gold processing technology, materials and full board with a new high-quality 2 -line 16 -character LCD, not only has the contrast knob, backlight selector switch, also has four directional buttons, an option button and a reset button; this 1602 LCD expansion board to simplify the circuit in the true sense, this plug directly board Arduino Duemilanove to the controller .