GeeekPi 5PCS IIC I2C TWI SPI Serial Interface Board Module Port PCF8574 Expansion Board for LCD1602 LCD2004 Display

Description: The I2C interface has a lot of pins on the Arduino for additional functionality,working perfectly with the LCD1602 and LCD2004. Modules can be cascaded up to eight. The device address can be modified by short-circuiting A0/A1/A2. 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 I/O port expansion via two bidirectional buses (I2C). The device includes an 8-bit quasi-bidirectional port and an I2C bus interface. The contrast is adjustable, and the blue potentiometer is rotated clockwise to enhance, and counterclockwise to weaken.With backlight power control, you can set whether to connect the backlight power through the jumper cap. The original LCD1602/2004 screen requires 7 IO ports to drive. This module only needs 2 IO ports to drive, which can save you 5 IO ports. Features: PCF8574T Chip I2C interface 8-bit parallel port Potentiometer Backlight control LED jumper switch Default I2C address: 0x27 Wiki: https://wiki.52pi.com/index.php/PCF8574T_LCD_Driver_Board_SKU:_D-0006 Package Includes: 5 x PCF8574T LCD Driver Board