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Adafruit MCP23017 I2C GPIO Expander Breakout - STEMMA QT / Qwiic
The Adafruit MCP23017 I2C GPIO Expander Breakout – STEMMA QT / Qwiic is a powerful and easy-to-use 16-bit GPIO expansion board that allows you to add more digital input/output pins to your microcontroller or single-board computer using only the I2C interface. Built around the reliable MCP23017 chip, this breakout is ideal for projects that require additional GPIOs without consuming extra pins on your main controller.
Designed with STEMMA QT / Qwiic compatible connectors, it enables solderless, plug-and-play connectivity with a wide range of development boards such as Arduino, Raspberry Pi, and ESP32 platforms. This makes prototyping faster, cleaner, and more efficient.
The board provides configurable I/O pins, internal pull-up resistors, interrupt support, and address selection pins, allowing multiple expanders to be used on a single I2C bus. It is widely used in robotics, automation systems, sensor interfacing, LED control, and industrial embedded applications.
Features
- Based on Microchip MCP23017 16-bit I/O expander
- I2C interface (only 2 wires required)
- STEMMA QT / Qwiic compatible connectors for easy chaining
- 16 configurable GPIO pins (input/output)
- Built-in pull-up resistors and interrupt capability
- I2C address selection for multiple device support
- Compatible with Arduino, Raspberry Pi, ESP32, and more
- Ideal for prototyping and embedded systems
Specifications
- Product Type: 16-bit I2C GPIO Expander Breakout Board
- IC Used: MCP23017 (Microchip)
- Interface: I2C (2-wire communication)
- GPIO Pins: 16 configurable digital I/O pins
- Operating Voltage: 1.8V to 5.5V
- Default I2C Address: 0x20 (adjustable via address pins)
- Expansion Capability: Supports multiple devices on same I2C bus
- Special Features: Interrupt pin support, internal pull-up resistors
- Connectivity: STEMMA QT / Qwiic compatible connectors + header pins
- Compatibility: Arduino, Raspberry Pi, ESP32, ESP8266 and other I2C devices
- Usage: GPIO expansion for sensors, switches, LEDs, relays, and embedded systems
Package Includes
- 1x Adafruit MCP23017 I2C GPIO Expander Breakout Board
