Camera feedback wiring and setting

PX4 Autopilot
1

Hi

I can not find any document for wiring camera hotshoe to pixhawk pins . how can i set feedback pin in pixhawk ? does it need any special circuit or not ?

2

To my knowledge their not much documentations.
However, I have manage to make it work with the Seagull Sync device.
Technically you just need to set the CAM_CAP_FBACK parameter to 1 and connect the feedback input to pin 6 on the FMU PWM OUTPUT

One thing to keep in mind is that the FMU will be set in 4 PWM 2 CAP mode which means that channel 5 & 6 are in capture mode.

3

Thanks alexandre
Have you done this and it works?

4

I’m using the Seagull REC to trigger the camera and the Seagull Sync for the capture feedback.
I’ve tried this setup in HITL where I had to make a small modification to make it work. I’m still waiting to test in flight

5

Hi Alexandre

Do you tested in flight ? does camera indicator works in qgc when feeback enabled ?

6

FYI master docs just got updated. Camera capture is PWM pin 6 on Pixhawk: http://docs.px4.io/master/en/peripherals/camera.html#hardware_setup

7

Hi Mohammad,

Yes it worked fine. I’m not sure if things changes since then so refer to the latest documentation.

Alex

8

@AlexandreBorowczyk did you use the CAM_CAP_FBACK=1 parameter in combination with TRIG_INTERFACE=1 (=> GPIO)?

As far as I understand TRIG_INTERFACE=1 will send trigger signals on pin 5 and 6 (by default), which seems conflicting with CAM_CAP_FBACK=1 (capture hardcoded on pin 6).

I’d be very grateful if you can clarify this for me.

9

Hi Alexandre
I’m trying to trigger the camera with seagull #REC. How did you do it?