FaBoGPIO-PCAL6408-Library This is a library for FaBo #210 GPIO I2C Brick. FaBo GPIO I2C Brick #210 GPIO I2C Brick PCAL6408A PCAL6408A is 8bit I2C I/O expander. PCAL6408A Datasheet PCAL6408A Datasheet Releases 1.0.0 Initial release. How to install Installing Additional Arduino Libraries