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LCD_I2C_PCF8574
PCF8575 i2c 16 bit digital I/O expander – Renzo Mischianti
GitHub - baget/PCF8574lib: Nanoframework Class Library for PCF8574 I2C
PCF8574 LCD I2C Backpack Module - Einstronic Enterprise
PCF8574 I2C IO Expander - Cookbook | Mbed
Pcf8574 Datasheet
Using an I²C LCD Display with a Raspberry Pi | Rototron