IOExpander Library An Arduino port of the Python library for the Nuvoton MS51 Pimoroni IO Expander Breakout: https://shop.pimoroni.com/products/io-expander Now supports the IOExpander based RGB Potentiometer, Rotary Encoder and Mics6814 Gas Sensor Breakouts: https://shop.pimoroni.com/products/rgb-potentiometer-breakout https://shop.pimoroni.com/products/rgb-encoder-breakout https://shop.pimoroni.com/products/mics6814-gas-sensor-breakout