The SparkFun Qwiic GPIO adds eight additional digital I/O pins to your project via I2C, based on the TCA9534 I/O Expander from Texas Instruments. Read and write pins just like standard Arduino digital pins using the included library — functions mirror familiar pinMode and digitalWrite calls.

All eight pins are broken out to latch terminals for tool-free wire connections. With three configurable address jumpers, you can connect up to eight Qwiic GPIO boards on a single I2C bus for up to 64 additional GPIO pins. Default I2C address is 0x27.

Key Features

• I/O Expander – TCA9534 with 8 digital GPIO pins
• Interface – I2C via Qwiic connector (1mm 4-pin JST)
• Default Address – 0x27 (configurable via 3 jumpers, up to 8 boards)
• Terminals – Latch-style terminals for tool-free wiring
• Arduino Library – Familiar pinMode/digitalWrite-style functions

Ideal For

• Expanding GPIO on pin-limited microcontrollers
• Qwiic ecosystem I2C projects
• Multi-board configurations needing up to 64 extra pins
• Rapid prototyping with tool-free connections

Package Contents

• 1× SparkFun Qwiic GPIO Board

Resources

• Hookup Guide