ANMBEST Anmbest 5PCS IIC I2C Serial Interface Board LCD1602 LCD2004 Blue Backlight LCD Display Adapter Plate PCF8574 Expansion Board for Arduino UNO R3 MEGA DIY Kit

1The I2C interface is a huge improvement freeing up a lot of pins on the Arduino for additional functionality Works fine with the LCD1602 and LCD2004 Modules can be cascaded up to eight The device address can be modified by shortcircuiting A0A1A2 The default address is 0x27 The default address can be detected by the program The module uses the PCF8574 which enables most MCUs to implement remote IO port expansion via two bidirectional buses I2C The device includes an 8bit quasibidirectional port and an I2C bus interface The contrast is adjustable and the blue potentiometer is rotated clockwise to enhance and counterclockwise to weakenWith backlight power control you can set whether to connect the backlight power through the jumper cap The original LCD16022004 screen requires 7 IO ports to drive This module only needs 2 IO ports to drive which can save you 5 IO ports.