The SparkFun I2C Expander Library makes working with 4-bit and 8-bit I2C digital I/O expanders very easy. These expanders can read or write four or eight separate I/O. This library supports using ...

This chip uses I2C to communicate, 2 pins are required to interface Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing ...

The library ... A 28nm Wirebond IO library with dynamically switchable 1.8V/ 3.3V GPIO, 5V I2C open-drain, 1.8V & 3.3V analog, OTP program cell, and HDMI & LVDS protection macros - featured across a ...