Its a bit late but for anyone else, who is looking for shutter feedback on the FLIR: you can use one PWM channel to do that and change the setting in the camera related PWM channel to “Frame sync” (in case of the Flir Duo Pro R it is PWM3). Then put the outgoing servo cable into one of the free servo connectors on your FC and assign the CAM_FEEDBACK_PIN to the used servo input.
I now use only the three PWM channels. One for triggering the camera, one for shutter feedback and the third is free of use but could be used for colour palette or zoom. With the shutter feedback, I will georef the images with Mission planner and I don’t need any MAVLINK data on my camera anymore.
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