Graupner HoTT telemetry integration for Pixhawk

[Johannes Lang]

Hi there!

is there a way to integrate HoTT telemetry into to APM stack for te Pixhawk hardware. 

There is a high potential for misunderstanding for Pixhawk users they are reading this tutorial: http://pixhawk.org/peripherals/telemetry/hott which works only for the PX4 stack.

Is there a way to port the PX4 telemetry code to the APM stack for Pixhawk see post https://groups.google.com/forum/#!topic/px4users/a9clqm8OEj0 ?

The main class linked in the prior topic can be found there: https://github.com/PX4/Firmware/blob/master/src/drivers/hott/hott_telemetry/hott_telemetry.cpp

Best regards

Hannes

[Randy Mackay]

 

     I haven’t looked closely at that code but I imagine it could be done by writing a library for the APM that runs only on the Pixhawk/PX4 that publishes the voltage, altitude, temp, GPS position and maybe current to the hott_telemetry process.  Then the start-up script for the Pixhawk (ardupilot\mk\PX4\ROMFS\init.d\rc.APM) so that that process is started.

 

     Inside the AC/AP code you would likely call this new library with the updated values each time an update is received from the GPS, current monitor, etc.

 

-Randy

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[NEVdD]

Hi all,

 

I too would be so interested of being able to get telemetry data directly on my Graupner radio using the pixhawk and APM stack, I have the 3DR telemetry set but when it come to portability it is way better to have everything on the radio than holding a smartphone on the side.

 

I am not a developper so I can only hope someone will adapt the PX4 code... Please? :D

 

Best regards

[Gary McCray]

Hi NEV,

I think it's largely a matter of resources, this is not a trivial task and there are a lot of product specific brands of telemetry out there and each of them has quite different communication protocols.

And I would think Graupner counts for a tiny fraction of our user base.

It may be that some general telemetry library that could easily be adapted to a variety of platforms might be possible, but that also is a really significant project.

The separate telemetry radio we are now using is a hardware solution to not having to provide a whole variety of custom firmware interfaces.

Of course, there are also a lot of radios that don't support telemetry at all so the hardware solution is the generally preferred one.

I think what it boils down to is that only an individual with the particular desire (and ability) to produce a radio specific solution is likely to undertake this.

And from my standpoint at least there are a whole lot of more interesting (new) things that would seem more important and more interesting.

I am not an authority on this and anybody who disagrees with me please say so, but I think the likelihood of this getting significant traction among our current developers is pretty low.

Best Regards,

Gary

[Robert Lefebvre]

I think that's basically it Gary.  Limited number of guys with limited time can only do a limited number of things.  So features are rationalized.  Plus, people are free to work on what they fell like.  This just hasn't been a priority.  Most of the top devs seem to be interested in doing away with the RCTx anyway.

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[Johannes Lang]

Hi! 

I agree, there are always some things with high priority. 

Therefore I hope to get some information how to integrate APM code into the Pixhawk firmware. There is already a working HoTT code for APM: https://code.google.com/p/hott-for-ardupilot/wiki/QuickStartGuideArduCopter Blog-Post: http://diydrones.com/profiles/blogs/graupner-hott-v4-telemetry-protocol-for-ardupilot 

Can this code be easily integrated in the Pixhawk firmware and updates for the current firmware release if necessary? 

I tried to find some ideas about the concepts of the APM/Pixhawk  development on http://dev.ardupilot.com/ , but I cannot see the wood for the trees. 

Is there a introduction which lead step by step into the concepts? Its very confusing that PX4 is also the name for the APM firmware as for the PX4 firmware of the PX4 project. 

Beste regards

Hannes 

[Johannes Lang]

Hi Randy,

is there a way to get HoTT Telemetry into the APM/Pixhawk release?

in the meantime Adam Majerczyk made an implementation that can be found here: https://github.com/3yc/hott-for-ardupilot/tree/master/PX4 

I would be great if this code can find its way into the regular firmware - possibly in future configurable via mission planner (com-port)

best regards 

Hannes

[Harald Becherer]

Hi,

I just got a very interesting device from André Kjellstrup
which does the Mavlink to HoTT conversion.
He plans to sell it if there is enough interest...

Of course a plugin to ArduPilot would be even greater.
By judging the download count of the HoTT telemetry integrated firmware
from Adam's site there are a lot of people interested...

Sincerely,

Harald