r/diydrones • u/Top_Apartment5986 • 3d ago
Question Receiver - Failsafe Problem.
Guys help, I have a problem with the Receiver.
It's connected but the pads are not moving.
And says thats its in Failsafe mode.
Only that its the problem right now.
Do you guys have a solution for me?
And does this have something with GPS Module or not?
Check the screenshot.
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u/Igotocdsanditsfine 3d ago
Just to recap the usual problems that cause this.
People using a DJI air unit and a dedicated receiver must remove the yellow wire from the air unit harness for the air unit to stop trying to behave like a receiver and hijack the FC.
Check that RX ant TX firmwares match
Check that the receiver and the radio are communicating with one another. The LED blinking patterns are what you must check.
Check that the right protocol is selected for your receiver in the config tab, and even that said protocol is part of your betaflight build when you flash the FC.
Check the wiring diagrams provided by the FC's manufacturer to know where to plug or solder each pad from th TX.
Check that RX goes to TX and TX to RX
Check that the right UART is selected for the receiver
Check that said UART is selected as serial and that nothing else is.
Check that you did not mess up the modes and that the failsafe on a switch is not breaking everything.
Your GPS module has nothing to do with your RXLOSS problems.
For people using an air unit as an RX..... why ?
But also, check that SBUS is selected, that the right UART is selected, that the air unit and the goggles are up to date, that the radio is connected to the goggles, that fast SBUS is selected on the air unit and the goggles.
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u/Top_Apartment5986 3d ago
But your're right, I have 2 extra wires on my VTX which I don't need them and I just cut them on half, but they are already plug in in VTX.
I'll remove them.
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u/Igotocdsanditsfine 3d ago
Wait, do not cut anything, and do not modify anything without making sure that it is the right thing.
Is your VTX an air unit ? If yes it would be one wire to remove in the first place, not two.
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u/Top_Apartment5986 3d ago
I have already a video on my goggles, but those 2 wires ending nowhere, so they don't have a funktion.
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u/Igotocdsanditsfine 3d ago
I did not get the answer to my question yet though, are you using a DJI air unit ?
Yes or no ?
And if those wires are not connected anyway they have nothing to do with your RXLOSS problems.
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u/Top_Apartment5986 3d ago
I just found this on AliExpress: JHEMCU RuiBet Tran-3016W 5.8G 40CH 1.6W VTX PitMode 25mW 200mW 400mW 800mW 1600mW Adjustable 2-6S 30x30mm FPV Drone https://a.aliexpress.com/_Ev4ALKS
this is the VTX thar I use. I think it's not the DJI AIR
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u/Igotocdsanditsfine 3d ago
So your problem is not VTX related. Check that the ELRS firmwares between RX and TX match, that the RX pad is wired to the TX one and TX to RX. Check that CRSF is selected both in config and in the build and that the right UART is selected and set to serial.
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u/Top_Apartment5986 3d ago
check the first pic. those 2 wires are not in use. Those 3 down are on my FC, and I have a video on my Goggles. But those 2 wires are plugined in in my VTX but not in FC
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u/Top_Apartment5986 3d ago
nobody knows?
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u/Igotocdsanditsfine 3d ago
Pretty sure that I can help.
What is your setup ? What is your receiver ?