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Telemetry Extension for Crossfire/ELRS

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(@heuer-m)
Active Member Customer
Joined: 3 weeks ago
Posts: 4
Topic starter  

I am currently using a TX16S ELRS and had the plan to switch from SRXL2 with telemetry to Crossfire removed link I assembled everything on a table for testing and found that the telemetry values are limited compared to SRXL2. I know that with ELRS you have to use some tricks. Rotorflight does remapping to work more appropriately for helicopters.

I am missing the following telemetry values:

- Main Battery Voltage
- Servo Voltage
- ESC Mosfet temperature
- Main rotor RPM 

I would like to upgrade my fleet of helicopters with Brain2 to Crossfire/ELRS since the Lua integration is also better. However, I can't really come to terms with the current state. Are there any plans to extend the telemetry?


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1139
 

Of course, as we have already done for other things, we will also do everything we can to overcome the limitations of this protocol.
We would like to point out that the "Main Battery Voltage" and "Main Rotor RPM" values are already transmitted by our flight controllers as shown on page 14 of the telemetry pdf manual which can be downloaded from the Downloads section of our website:

README_for_ESC_datas_log_and_telemetry.pdf

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We would like to remind you that in the same document it is also explained that in order to have the "extended limits" on all channels with also channel 5 working like the other channels, it is necessary to use "333hz Full" as Packet Rate and "16ch rate/2" as switch mode:

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As also explained in the table on the ELRS website on the Switch page:
https://www.expresslrs.org/software/switch-config/?h=switc#summary-of-switch-configuration-modes

In addition, we suggest to use in the transmitter configuration the same radio channel configuration as our default flight controllers for the Crossfire protocol (TBS/ELRS) so that channel 3 provided by ELRS for Throttle control (AETR) is used for collective pitch control (AEPR) remaining in the group of the first 4 channels and channel 5 is used for the selection of the three possible controller setups as follows:

immagine

   
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(@heuer-m)
Active Member Customer
Joined: 3 weeks ago
Posts: 4
Topic starter  

Thank you for this reply, I will test it this afternoon.

BUT, If I download the pdf, I cannot find the section about rpm reuse. May there is an old document? Thats why I was not aware of this point.

Screenshot 2024 06 26 151130

 This is whats in the freshly downloaded pdf


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1139
 

Did you download the document from the download section of our website, from here?

immagine

In our post to make it easier for you, we also gave you a direct download link. Did you use this link?

README_for_ESC_datas_log_and_telemetry.pdf

But apart from the documentation, if you do an automatic search, the three 'Attitude' sensors (pitch, roll, yav) should automatically be found.
If they are not found, it means that you are not using the latest firmware version.


   
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(@heuer-m)
Active Member Customer
Joined: 3 weeks ago
Posts: 4
Topic starter  

Yes, I had downloaded the file multiple times on different devices because I thought I was being silly, and I knew the document even before this post here. But until this post, I didn't have a version where this part was included. Yesterday, to be sure, I used exactly the link. But I checked it multiple times, and that important part wasn't there.

Now this morning, in the download, this passage is included. Now I know how it should look, and I recognized that it was included only in the latest update.

I was able to verify it, and it works. It seems that work is currently being done on it. So, I hope that temperature and servo V will be added soon.

Thanks for the new information.


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1139
 

In addition to the ESC and/or engine temperature (fundamental alarm to avoid permanent damage to the ESC or to the engine) and the Servo Voltage, we will also try to add the vibration percentage (fundamental for the average life of the model's mechanics and for determining the frequency of periodic inspections) and the percentage of the ESC power output, which is fundamental in the case of using the ESC governor to understand if the ESC governor is working at the limit or at too low values (instead in the case of using the flight controller governor, the curve of this parameter follows the trend of the Throttle curve).

It should not be forgotten, however, that all these parameters, even if not transmitted via telemetry, can be recorded in the flight data memory of the flight controller and reviewed and checked at the end of the flight to get an idea of their trend.


   
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(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1139
 

In addition to the ESC and/or engine temperature (fundamental alarm to avoid permanent damage to the ESC or to the engine) and the Servo Voltage, we will also try to add the vibration percentage (fundamental for the average life of the model's mechanics and for determining the frequency of periodic inspections) and the percentage of the ESC power output, which is fundamental in the case of using the ESC governor to understand if the ESC governor is working at the limit or at too low values (instead in the case of using the flight controller governor, the curve of this parameter follows the trend of the Throttle curve).

It should not be forgotten, however, that all these parameters, even if not transmitted via telemetry, can be recorded in the flight data memory of the flight controller and reviewed and checked at the end of the flight to get an idea of their trend.


   
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(@heuer-m)
Active Member Customer
Joined: 3 weeks ago
Posts: 4
Topic starter  

Good to know, thanks for the information. Then there's nothing against operating all my Brain2 with ELRS. That's great.


   
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