#Receiver not working correctly

1 messages · Page 1 of 1 (latest)

vale niche
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Hello,
I have got a problem with my first ever FPV build (I am a noob).
My ELRS Receiver works perfectly fine, while the FC is connected to Betaflight via the USB-C cable, but when I unplug the USB cable I lose Telemetry. (It recovers and gets lost immediately again - this repeats) under that condition I also cant arm the quad.
Meanwhile the power led on the FC indicates that the FC is operating at all times.
What also happens is, that as i lose telemetry the betaflight OSD in my Goggles also disappears, and only reappers, when i regain telemetry - can this indicate a general UART problem with all UARTs?
In order to solve that problem I have tried two different UART on the FC (UART1 and UART2) and reflashed Betaflight completely and tried to connect with different output powers from my Radio.

I use the Speedybee F405V3 Stack, the BetaFPV Nano 2,4GHz ELRS Receiver, and the Radiomaster Boxer!

Can somebody help me please, thank you very much already!

On the photo it looks like the R2 and T2 connectors are shorted (this is the receiver), but i measured the resistance and can assure, that this is not a short.

WhatsApp_Image_2023-08-01_at_21.36.08.jpeg
rigid bramble
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Try UART6

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And remove the power wire from the WS VTX and plug in a battery to see if you have the same issue when the VTX is not powered on

vale niche
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I tried to removed the VTx power already, same issue appears

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i will try UART6 now

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i am not good at soldering, this might take a while

vale niche
rigid bramble
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If there is no change after doing that, please take a video of the behavior

vale niche
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how do you flash via passthrough

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i always get an error

rigid bramble
vale niche
vale niche
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I can now confirm, that the receiver works properly, but the FC keeps restarting, thats the problem!

vale niche
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it works with 4s but not with 6s for some reason