Hi, I would be interested to help modify open source electronics circuits for the Bar30 to enable easy interface with the BNO055 sensor breakout board as commonly sold on ebay.
Unfortunately OpenROV aren’t Open Source Hardware (and electronics) but your PCB is! The complete sensor breakout retails for about 15$ (ebay), whereas BlueRobotics dont sell any 9 axis attitude sensor, other than that integrated into ArduPilot.
Further the BNO055 sensor is a hard to hand solder ball package.
What do you think, 4 pins on each side of the BNO055 sensor breakout board, or 8 one-sided, to enable interaction with the Bar30 Sensor?