MCP23017 I/O expander

[FDelporte]

The MCP23017 is an I2C port expansion chip (https://www.best-microcontroller-projects.com/mcp23017.html)

• Add 16 I/O pins per chip
  

• Add up to 128 I/O pins (8 chips)
  

• Full bidirectional I/O pins, with pullups
  

• Has interrupt ability (separate pin)
  

A lot of info is available in Pi4J/pi4j#138