The Waveshare IO Expansion Board, based on the MCP23017 chip, allows you to extend two I2C signal pins into 16 versatile input/output pins for your electronic projects.
This board is helpful for microcontroller enthusiasts who need more I/O options, such as connecting additional sensors, buttons, or LEDs to devices like Raspberry Pi, Arduino, or STM32, without modifying the core hardware.
- I2C-controlled expansion from 2 to 16 I/O pins, supporting up to 8 boards for a total of 128 pins
- Configurable I2C address using onboard jumpers for flexible setup
- Multiple connection options, including PH2.0 terminals and solder pads for easy stacking
- Built-in voltage translator for seamless compatibility with 3.3V or 5V systems
- Includes development resources with examples for popular platforms
With dimensions of 38mm x 23mm and 2.0mm mounting holes, it fits neatly into compact project enclosures.
This expansion board suits users expanding capabilities in DIY electronics, offering practical solutions for pin-limited designs.
