Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout - STEMMA QT / QwiicThe Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout is a versatile I2C GPIO expander and keypad matrix driver that packs a lot of power into a small package. With 18 total I O pins, including 10 columns and 8 rows, this chip is perfect for handling keypads, buttons, or LEDs in your projects. You can use it to create a keypad matrix with up to 80 switches, or configure the pins as individual GPIO inputs or outputs. Key Features: GPIO