GitHub

Arduino library for PCF8574 - 8 channel I2C IO expander.

The PCF8574_LH library provides a simple interface for controlling the PCF8574 I/O expander using the I2C communication protocol. It allows you to read and write values to the PCF8574's registers, ...
GitHub

Arduino Library for LiquidCrystal displays with I2C PCF8574 adapter

A library for driving LiquidCrystal displays (LCD) by using the I2C bus and an PCF8574 I2C adapter. There are modules that can be soldered or stacked to the display that offers an I2C interface for ...
EDN

PCF8574 & I/O Quick Start

A while ago I received a couple of I/O port expander modules that use the I 2 C protocol. Using that Chinese module, you can use only the SDA and SCL pins of your Arduino, or any microcontroller ...