Matek 405-STD – For Bi and Tricopters

[jihlein]

One thing to be aware of, BetaFlight uses softserial, and they account for the SPort signal inversion in the softserial code. dRonin does not have softserial, you must use a physical uart tx pin, and the signal between the RX and FC must be inverted, either thru an external signal inverter or the non-inverted SPort hack.

[jihlein]

Just had a side conversation with @Keven_Erik. He does indeed have the R-XSR working with dRonin on the Matek405 target. In his case, he is using UART4 TX as the input pin.

So I would recommend checking over the wiring and setup carefully, and see if you find anything there.

[Fosch]

Hi

Thanks for you help, however that’s still not working…

-R-XSR firmware up-to-date with last LBT firmware
-S.Port uninverted hack : soldering on the tiny pad is good, I check the continuity with a multimeter from a pin of the RXSR chip to TX4 pad)
-Telemetry given by the RXSR itself (RSSI+BtRx) is working, but no telemetry data coming from the FC.

I have attached some pictures. Should I enable something else ?

Does Kevin_Erik use a MATEK F405 STD & RXSR with LBT firmware ?

Attachments:

1. 

   Function.jpg
   

2. 

   Hardware.jpg
   

3. 

   Modules.jpg
   

4. 

   Output.jpg
   

5. 

   RXSR-hack.jpg
   

[jihlein]

Another thought – is it possible it is working, but you are using LUA scripts written for BetaFlight? The data format and packaging is different between dRonin and BetaFlight unfortunately.

Maybe check and see what sensors are being discovered on the Taranis?

[Kevin_Erik]

dRonin Lua script can be found here as an attachment on first thread: https://rcexplorer.se/forums/topic/dronin-f405-ctr-target-testing/#post-58340

Be aware that the R-XSR has two operating modes selectable by holding the bind button after power up. This changes its communication protocal (sbus / cppm) and is shown by what color LED is lit. (sbus = blue)

https://www.frsky-rc.com/product/r-xsr/

[Fosch]

Only RSSI & BtRx sensors are discovered by the Taranis, even after creating a new model on the Taranis.

I’m afraid I’m going to give up with telemetry unfornately…

[Fosch]

and S.BUS is working, I see it through dRonin GSC, however thanks for the LUA link 🙂

[Kevin_Erik]

Did you try that LUA i posted?

After installing the Lua, you will need to reboot the Taranis and then “discover” sensors.

[Kevin_Erik]

From the pics you added, your setup looks good on the copter. Only three things could be wrong.

-Wiring
-LUA
-Faulty R-XSR, but i assume it works on Betaflight?

[Fosch]

I didn’t come back to Betaflight to check if the telemetry is still working.

However, I’ve changed the receiver to a XSR-SB (S.Port on TX3) and I got the Lipo battery voltage only, but nothing else (no accelerometer, etc.). It is normal ?

And dRonin LUA script is not working. Please have a look to the pictures.

Attachments:

1. 

   Sensors.jpg
   

2. 

   LUA.jpg
   

[Kevin_Erik]

Wondering if there is something different about your Taranis. Its obvious that the Telemetry is there but its not being understood by the Taranis.

I assume you rediscovered sensors?

Silly question, is Telemetry enabled in your Teranis for the bound receiver? I ask cause its easy to mis-click this and select channel settings other than Telemetry.

Please make a pic of your Binding settings.

[Fosch]

Yes I deleted and rediscovered the sensors.

I’m using Opentx 2.2.2

Maybe I should full erase my Taranis?

PS: binding pictures coming soon

[Fosch]

I’m not sure what you mean by “Telemetry enabled in your Teranis”

Is it the picture your are expecting (with XSR-SB) ? Otherwise please show me an example

Attachments:

1. 

   XSR-SB-Bind.jpg
   

[Kevin_Erik]

To change to Telemetry settings, you have to rebind the receiver.

Attachments:

1. 

   E58421D8-73E4-42F5-841D-D9CC0DB5E69F.jpeg
   

[Fosch]

Yes, I rebound the 2 receivers with “Telemetry ON”

I’m using LBT EU firmware, I don’t if it could be the reason.

Tomorrow I will erase all data from my Taranis

[Author]

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