The Optical flow sensor is not his, it is: https://pixhawk.ethz.ch/px4/modules/px4flow https://pixhawk.ethz.ch/px4/modules/px4flow I say this, because the 3Dro

The Optical flow sensor is not his, it is: https://pixhawk.ethz.ch/px4/modules/px4flow https://pixhawk.ethz.ch/px4/modules/px4flow I say this, because the 3Drobotics/DIYdrones guy doesn't go out of his way to make these distinctions. These swiss guys have 3Drobotics/DIYdrones place the parts & sell their board because these guys have very aggressive marketing & a pick & place bot. This allows them to focus on the actual engineering. 3Drobotics/DIYdrones have a fork of the Swiss guys code with a generic interface plastered over the top. They are moving to this hardware, because "their" own hardware is out of date & no longer competitive with the current generation of STM32 hardware everyone now uses. They have a couple of employees who are capable of making this eventually approximate the original design.