Pixhawk/APM flight control only one I2C interface, such as the need to connect more than one I2C peripheral, you can use the line board; Pixhawk - I2C points line board with five completely parallel vertical 1.25 4 a socket, convenient connection in the form of 1 drag 4 four I2C peripherals, for example, at the same time use the external compass and RGB modules. I2C line board and Pixhawk flight control the appearance of the connection (please note that this price includes only the I2C line board and cable) : Size: 12 × 30 × 6mm   Package included: 1 x I2C breakout board   1 x Cable 60mm