![Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics](https://m.media-amazon.com/images/I/81LF5fUXHLL.jpg)
Amazon.com: CQRobot Ocean: MCP23017 IO Expansion Board Compatible with Raspberry Pi/Micro:bit/Arduino/STM32 Motherboard. I2C Interface, Expands 16 I/O Pins, Up to 8 Expansion Boards Can be Used Simultaneously. : Electronics
![MCP230xx IO Expander | Character LCD with Raspberry Pi or BeagleBone Black | Adafruit Learning System MCP230xx IO Expander | Character LCD with Raspberry Pi or BeagleBone Black | Adafruit Learning System](https://cdn-learn.adafruit.com/assets/assets/000/018/263/medium800/raspberry_pi_RaspberryPiRGB_MCP_bb.png?1405985057)
MCP230xx IO Expander | Character LCD with Raspberry Pi or BeagleBone Black | Adafruit Learning System
GitHub - custom-build-robots/Raspberry-Pi-MCP23017-library: Easy to use library for the MCP23017 connected to a Raspberry Pi
![Interfacing an I2C GPIO expander (MCP23017) to the Raspberry Pi using C++ (SYSFS) « Adafruit Industries – Makers, hackers, artists, designers and engineers! Interfacing an I2C GPIO expander (MCP23017) to the Raspberry Pi using C++ (SYSFS) « Adafruit Industries – Makers, hackers, artists, designers and engineers!](https://cdn-blog.adafruit.com/uploads/2013/04/mcp23017test_bb.png)