SMAKN&reg; Pixhawk-i2c Splitter Expand Module for 1 trailer 4 Pixhawk APM Flight Controller Pixhawk / APM flight control only one I2C interface, the situation To connect over multiple I2C peripherals, you can use this breakout board; Pixhawk-I2C Breakout Board with five completely parallel vertical 1.25-4 bit socket convenient in 1 trailer 4 is connected four I2C peripherals such situation while using an external compass module with RGB or hope the case of connecting a plurality of RGB modules Pixhawk-I2C module x 1. 4P cable 150mm x1.