DJI FPV configuration

Configuring ArduPilot for DJI FPV

If you’re using the DJI FPV system, here’s the relevant configuration you need to set:

  1. Set OSD_TYPE=3.
  2. Set SERIALn_PROTOCOL=33 SERIALn_BAUD=115 SERIALn_OPTIONS=0 (DJI FPV).
  3. Create a text file called naco.txt on the SD card of the Air Unit with the text 1 in it to unlock full power.
  4. Create a text file called naco_pwr.txt on the SD card of the goggles with the text pwr_2 in it to unlock more full power.
  5. Set “Custom OSD” to “on” in the goggles menu.
  6. Arrange your OSD elements how you like them.

That’s it!

Configuring AP for the DJI O3

If you’re using DJI O3, this is what you need to do:

  • Set , OSD_TYPE=5 for MSP_DISPLAYPORT.
  • Set SERIALn_PROTOCOL=42 SERIALn_BAUD=115 SERIALn_OPTIONS=0 for DisplayPort.
  • Set MSP_OPTIONS=5 for telemetry mode and BTFL fonts.
  • Arrange your OSD elements as you want them.

Done!

Synchronizing the video and audio of the DJI Air Unit

The audio of the DJI air unit is slower than the video, leading to desynchronization, but it is slower by a constant factor, which means it can be easily corrected with the following command:

$ ffmpeg -i "$1" -c:v copy -filter:a atempo=1.001480,volume=20 \
         -c:a aac -b:a 93k "$(basename "$1" .mp4)_fixed_audio.mp4"

Last updated on January 01, 2023. For any questions/feedback, email me at hi@stavros.io.