Hi, apologies for my ignorance but I’m new to the Pixhawk and Ardupilot flight stack and I’ve not been able to find a clear explanation online thus far.
For a school project we currently have a Pixhawk4 running firmware version 3.6.11, airframe Quad X. We’re trying to set up a camera trigger and so far I’ve set the CAM_TRIGG_TYPE to Relay, and have tried setting the RELAY_PIN to every different option but never got a signal.
I think this may be related to how we have out Pixhawk connected to the power distribution board. The I/O PWM OUT from the Pixhawk is connected to the FMU PWM IN on the power board, and the FMU PWM OUT on the Pixhawk is connected to I/O PWM IN on the power board. We did this after finding out that the ESC signal cables were getting PWM info from the FMU-PWM-OUT pins of the power distro board.
I mention this because I switched the FMU and IO cables from the Pixhawk to power board and the camera trigger works but now out ESC’s don’t get a signal.
So I think this comes down to me not really understanding the FMU vs IO outputs/inputs. We had a very similar setup working with the camera trigger on an older Pixhawk, the one that had the Main and AUX out pins on the back, but with this new flight controller we’ve not been able to transition over very smoothly. Any guidance would be greatly appreciated.