Recent content by BudWalker

That's probably best. I can't really determine the cause. E.g. at the end where motorSpeeds go to 0 the voltage at the motors shows 0.0. That shouldn't happen. Normally, the motor voltages will be close to the battery voltage. I don't know what would cause that...

I'm still looking at FLY210.DAT (the first flight). But, FLY212.DAT looks like the software crashed at time 7.375 secs when the P4PRTK was at 4.6 m above take off. Looks like it had travelled 2.6 m from launch site. Is there anything more you can say about the second flight?

Take a look at How to retrieve a V3 .DAT File from the AC which describes the retrieval method based on an older DJI Assistant 2. You probably will need to use the newer version, DJI Assistant 2 for Phantom. If you can mount the P4 disk drive the .DAT you want is FLY210.DAT. If you can't mount...

Had a brief look at that incident. Seems in that incident there was clear evidence of high cell voltage deviation. That didn't happen in this incident.

Looks like a problem with the right front motor. At time 1094 secs the P4 began to tumble. Rolling CW, pitching down end over end and yawing CCW. All consistent with right front reduced propulsion. The P4 also began it's uncommanded descent. Then at time 1096.5 the eventLog shows that a motor...

No idea what this entry means - except that it's about the GPS system. The entries in the eventLog stream are mostly debug statements used by DJI engineers. As such they are only occasionally useful to us non DJI engineers. Often these entries describe some problem that has no material adverse...

You might want to open it up and check the connections to the GPS receiver. After that try replacing the GPS receiver. Here is a YouTube Looks a bit tricky to my 75 yo eyes and fingers.

There is a field, SMC, in the GPS monitor record. Usually it's value is close to 80.0. But, in this .DAT the value exceeds 180 which then coincides with the switch to ATTI. When SMC (top red curve) departs from 80 the satellite count (bottom blue curve) drops to 0 and the FC's confidence in...

Looks like the left back prop failed. To see more take a look here My P4P Pro v1 Went Into a Spiral and Crashed

If you can provide the P4P-RTK on board .DAT it will likely have some data about the abrupt power loss. That's the .DAT from the P4P-RTK itself not the .DAT that can be found on the mobile device. It will be large so you'll need to upload it to a public sharing site like DropBox or GoogleDrive...

I looked at FLY188.DAT and it appears this was an abrupt power loss like what is seen if the battery is dislodged. But, since that appears not to be the case I suspect the battery's internal circuitry is at fault. To be clear, the power loss is so abrupt it's not a case of voltage sag, etc. By...

Makes perfect sense. The accelerometer sensors will always have some bias which translates to some movement even though the P4 is at rest. If that bias is excessive then the P4 uses the "moving" label instead of the actual bias. The IMU has a heater that brings the temperature to, and then...

Could you be a bit more specific? Are you looking at the accelerometer data?

Check out How to retrieve a V3 .DAT File from the AC which shows you how to use DJI Assistant 2 to retrieve a .DAT log from the P4. If you can't power up the P4 then you'll need to extract the internal SD card that contains the .DAT log file.

I looked at this some. It appears that there was a loss of propulsion in the right back corner. But, it's not your typical motor blocked or broken prop scenario. At 562 secs the P4 starts to tumble CW yaw, CW roll and pitching backwards end over end. These are all consistent with right back...