SwitchDoc LABS I2C 4 Channel Mux TCA9545A based Breakout Board for Arduino and Raspberry Pi Converts one I2C bus (on Pi or Arduino) to 4 separate I2C buses Supports Arduino (5.0V I2C) and Raspberry Pi (3.3V I2C). All 4 I2C busses can have 5.0V or 3.3V power. I2C Controlled (both 3.3V and 5.0V) Software drivers provided for Arduino and Raspberry Pi Full Documentation and Software for Raspberry Pi and Arduino on www.switchdoc.com