Had a scary thing happen couple weeks ago. When I armed the quad, the motors started spinning, but BF turned off in my OSD and I could not disarm using my radio (RM boxer). Luckily it stayed on the ground. I put my foot on the quad and the motors started spinning up and tried to take off! Luckily I was able to pull the battery plug out. It was flying fine before. No hard crashes or any damage I can think of. No changes in BF too. I tried changing both the Tmotor 55A PRO II ESC and Tmotor F7 Pro FC, but I'm still having the same issue. When I arm the quad, OSD in my goggles turn off, motors start spinning and I can not disarm unless I pull out the battery plug. Props are off now. The receiver and transmitter remain bound when this is happening too. I am still getting video in my goggles but there is no BF OSD. I have tried different ELRS receivers and transmitters too. The only thing I have not swapped out are the motors and the O3 air unit. I have left the GPS unit disconnected. I have no idea what the issue is. Anyone have any ideas or similar experiences?

Motor will spin on arming unless you set it to stop on arm.

Are you able to record a blackbox log? And post it.

OSD seems to be a separate issue, that we addressed later.

i would suggest to adjust the range in bf configurator modes tab, increase the range for disarm position a little bit to be sure it doesnt come from there.

i wouldnt suggest to try keep the quad on the ground if it doesnt follow the inputs, its more dangerous. risk a flyaway in that situation is my route.

take care to get enough distance to yourself and the transmitter between you and the drone.
if you got the same issue again, it sounds strange but power off your transmitter; that will give the best chance to get in controll by produce a failsafe.

as voodoo told, a blackbox log would help. would tell what switch position was received and more..

Quote: I am still getting video in my goggles but there is no BF OSD. I have tried different ELRS receivers and transmitters too. The only thing I have not swapped out are the motors and the O3 air unit. I have left the GPS unit disconnected. I have no idea what the issue is. Anyone have any ideas or similar experiences?

Hi MajorKook,

Is SmartAudio required for your use-case?  In the diagram, you can see a possible UART conflict.  Many t-shooting sessions have suggestions about disconnecting SA wire on 03 Air.  As an alternative (if SA required?), move your ELRS RX to an open UART and set the ports page accordingly.

The OSD ghosting out is just too much of a coincidence for this NOT to be UART "usurping"

If this isn't the issue, a full dump file might help to troubleshoot it.

Hope this helps, though??


   

Success!! I moved the ELRS to another UART and that seems to solve the problem at least on the bench. Thank you!!

I guess I should tell Tmotor about this. They recommend receiver on UART2.

(29-Nov-2023, 01:24 AM)MajorKook Wrote: Success!! I moved the ELRS to another UART and that seems to solve the problem at least on the bench. Thank you!!

I guess I should tell Tmotor about this. They recommend receiver on UART2.

Glad you got it going!  I wonder if T-Motor's quick-start guide presumes that the 03 Air unit will be used with DJI-FPV handset only??
Their Aux2 connection in the diagram would not be SmartAudio, but they connect that wire in the multi-pin.

All's good, anyway