Hey @kklemens/BlueROV gang,
I also just had a similar problem on a current build and thought I should report it as it was weird and also definitely didn’t/doesn’t require sending out a new Pixhawk…
It’s a heavy setup so I’m using all 8 output channels. As with the original post, the problem I had was with output channel 5. Strangely, everything was working fine, but I realised that I had to update the companion software (0.0.17 - > 0.0.31) and also had to work on another problem which required disconnecting all the ESCs (one of the lessons of this tale is to only troubleshoot one issue at a time!) Once all the ESCs were reconnected I ran a motor test and #5 was unresponsive. I checked all the ESC connections as I thought I might have rewired badly but couldn’t see any issues. I then swapped the connections for motors 4 and 5 around on the pixhawk. That got motor #5 working and #4 stopped, isolating the problem to the pixhawk itself or the software/settings, which I thought unlikely. However, I went into the SERVO menu of the parameters section of QGC and lo-and-behold, servo 5 was coming up as “disabled”. I selected motor 5 and voila, back in action.
No idea why that servo would have been turned off - I was previously unaware of the SERVO part of the parameters, so I hadn’t been in to that menu myself and turned something off. Best guess is that it was something to do with the companion software update? So i thought you all might want to know for future development etc.
In terms of the version that I flashed to the SD card: I got the link for that from this forum yesterday (No companion update button available - #42 by bjcresswell) but it’s worth noting that there are various links to “update” the companion software. Might be worth going through older threads and deleting old links or pointing them all to one “master” software update page?? Sure you guys are engaged with this, but just an observation from an end user.
Let me know if you want any more info on this.
Cheers
Ben