Discussions

Pixhawk with DJI Lightbridge

Posted by Chris L on October 30, 2015 at 8:36pm

Has anyone been able to configure a Pixhawk to work with a lightbridge HD link?

I'm able to get the Lightbridge control signals to the pixhawk but I've yet to figure out how to set the FailSafe. When I turn off the RC controller, the lightbridge air module continues to output the same S.Bus channel signal levels.

From talking to others I've found out that Lightbridge outputs the fail-safe "flag" in the header or footer (I'm not sure which) of the S.Bus signal (not the normal PPM channels like the pixhawk is expecting). Can anyone confirm this is true and if so, how can I map the DJI Lightbridge failsafe signal to the Pixhawk's failsafe.

Thanks!

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Replies

andreas kellermann December 11, 2015 at 11:36am

+1
Ruchat Laurent December 11, 2015 at 8:58am

Totally agree +1
Chris L December 11, 2015 at 7:33am

Agree
Talon Six December 10, 2015 at 6:10pm

+1
Olivier December 10, 2015 at 4:06pm

Good points. Agree except for 1/5th the range, I don't think you can even get close to 5km with LB, at 1080 resolution. Maybe 1/2, if that. That said I don't have first hand experience at those distances.
Olivier December 10, 2015 at 3:29pm

@ Guy: "There's simply nothing else on the market that can compete in terms of performance at that price point."

Connex .... At $1600 it's a bit more expensive than LB2 at $1,400, and does not quite have the range, but low latency, less proprietary with generic UAV and 1080/60 HDMI out supported independent of FC, and includes Mavlink support.

Similar tech as Lightbridge and 4G LTE, FHSS/DSSS/OFDM/MIMO I think but at 5.8Ghz, with MIMO 5x2.
Tobias Witting December 10, 2015 at 2:56pm

thanks for this information. I didn't know this. Solo is using normal wifi, though, isn't it?
Marc Dornan December 10, 2015 at 1:18pm

What is more remarkable is they bundle this technology into the Phantom 3 (pro) for very little extra upcharge while the standalone unit costs almost as much a P3 pro itself. I am not sure it is quite as good as a standalone unit, or exactly the same, but I have had it out to almost 3k.
- andreas kellermann > Marc Dornan December 11, 2015 at 2:27pm
  
  It just shows that the hardware itself is cheap. You pay so much for the lightbridge 1 because it was the first affordable system. And now you pay as much for the lb2 because after you realize that your phantom is too small for a better cam / you are a "pro" there is still no option around the lb2 so you buy it even at 1400$.
andreas kellermann December 10, 2015 at 1:56am

FYI I just found some actual photos of the internals:

http://bbs.5imxbbs.com/bbs/forum.php?mod=viewthread&tid=946919

Seems like they really made sure to remove the silkscreen on every single component... And I`m pretty sure they enabled every protection mechanism they could think of. Not good :(