SparkFun Qwiic GPIO

Do you find yourself wishing that you had just a few more GPIO pins? What if you only need that one more pin? You could add another microcontroller to your project, but this would increase the cost and complexity. Instead, you can use the Qwiic GPIO to add eight new pins to your Qwiic project! The Sparkfun Qwiic GPIO is an I²C device based around the TCA9534 I/O Expander IC from Texas Instruments. The board adds eight additional I/O pins, which you can read and write just like any other digital pin on your controller. The details of the I²C interface have been taken care of in an Arduino library, so you can call functions similar to Arduino's pinMode and digitalWrite, allowing you to focus on your creation! The TCA9534's pins are broken out to easy-to-use latch terminals; never screw another wire into place! The terminals are relatively spacious themselves, so feel free to connect multiple wires to a ground or power terminal. With three customizable address jumpers, you can connect up to eight Qwiic GPIO boards on a single bus, allowing for upwards of 64 additional GPIO pins. The default I²C is 0x27 and can be changed by adjusting the jumpers on the back of the board.