IIC I2C TWI SPI Serial Interface Board Module Port for Arduino LCD1602 Display This is a I2C Serial LCD Daughter board that can be connected to a standard 16×2 or 20×4 Character Display Module that supports 4-bit mode. All Character Modules sold on our site support 4-bit mode, and nearly all commercially available 16×2 and 20×4 line character modules support it too. This board has a PCF8574 I2C chip that converts I2C serial data to parallel data for the LCD display. Features: 16 x 2 Character LCD display is controlled via just two wires Up to 8 LCD displays with adapters can be connected and controlled by the same two wire I2C bus Easy to control using Arduino board Compatible with 16 x 2 character LCD displays Adapter includes 16-PIN male header connector for soldering to LCD display Contrast is adjusted via onboard potentiometer Backlight may be turned on/off via jumper Standard 5V voltage supply