The library gives easy control over the 16 pins of the PCF8575 chips. Base address = 0x20 + 0..7 depending on address pins A0..A2. PCF8575C 0x20 to 0x27 need pull up in input mode. See #36, to be ...
This repository provides explanations on I2C for the AVR microcontroller, including its setup, and introduces the relevant libraries and APIs for configuration and usage.