Time Lapse Prototype Build! Adafruit PCF8575 I2C 16 GPIO Expander Breakout - STEMMA QT / Qwiic 🔧🔌⚙️ Expand your project possibilities, with the Adafruit PCF8575 GPIO Expander Breakout - an affordable 16 channel I2C expander. GPIO expanders work like this: you have a board with some number of GPIO but not enough for your project - maybe you need more buttons or LEDs. Connect it over I2C and then you can send/receive I2C commands to control the GPIO pins to write and read them. It's going to be