Crius Pixhawk-i2c Splitter Expand Module for Pixhawk APM Flight Controller + 1 Hobbypower strap expands the I2C port to allow up to four additional peripherals to connect to Pixhawk. Use the 4-wire cable to connect the I2C splitter and add a compass module, external LED, digital airspeed sensor, or other peripherals to your vehicle. Pixhawk-I2C module