SunFounder IIC I2C TWI 1602 Serial LCD Module Display for Arduino Uno R3 Mega 2560 16x2 Easy to use. Less I/O ports are occupied, only four - VCC, GND, SDA (serial data line), SCL (serial clock line). Support IIC protocol. The I2C LCD1602 library is provided, so you can call it directly. With a potentiometer used to adjust backlight and contrast. Power supply: +5V Address of the module: ox27