LibrePilot Forum

General Category => General Discussion => Topic started by: karla on January 24, 2018, 07:31:40 am

Title: Librepilot Next and RC control over OPLink telemetry
Post by: karla on January 24, 2018, 07:31:40 am

Hi,
this is a continuation of an interesting sub topic from the thread, GPS assist and Heli (https://forum.librepilot.org/index.php?topic=3999.msg27715#msg27715)

As far as I understand, If you have a working telemetry data link, you can get RC control, without adding a separate PPM stream (dedicate another port) on the reciever side (airborn side).

I am really interesed in getting this to work properly. However it works, it suffers disconnects some 4 times every 10 seconds and reconnects again, that creates failsafe mode every time. I would be very glad to get some help sorting out where the problem lies.

(https://forum.librepilot.org/index.php?action=dlattach;topic=4091.0;attach=7118)

This is my set up producing the result in the picture.

Ground side: An OPLM unit that gets PPM controls from my transmitter via the trainer port.
Heli side: Another OPLM unit that receives and sends telemetry and connects only via Mainport to a Revo Nano board (mainport set for Telemetry).

We see the graph from the transmitting OPLM.

Title: Re: Librepilot Next and RC control over OPLink telemetry
Post by: f5soh on January 24, 2018, 06:34:08 pm

Did you try another OPLM ?
I cannot reproduce your issue here so there is difficult to fix.

How is powered the OPLM in both sides ?
Can be the digital servos adding noise to the voltage source ?
Just ideas...

Title: Re: Librepilot Next and RC control over OPLink telemetry
Post by: karla on January 26, 2018, 07:29:42 am

Thanks,
After trying another OPLM that worked fine I tried the old one again, and today I can not reproduce the error, even if I try my hardest.
Maybe a ghost walked by my gear...
Or I will be back later.
For now, no issue if using a Nano and 2 OPLM units.