My friend and I are building an ROV. Our current setup is a computer sending data to the topside Fathom-S USB port, then the topside board sending that data down to the Fathom-S ROV board via ethernet cable, then the ROV board sending serial data to an Arduino MEGA as this diagram shows.
However, when we output serial data through the computer, the MEGA was not getting the signal. Are we right in assuming that’s how it should work? Should we use an UNO rather than a MEGA? Should we just forget it and strictly use the Fathom-S boards for our camera with just a USB extender cable to communicate between the MEGA and the computer?
I can take pictures of our setup if necessary.