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MPU-9250 instead of MPU-9255?
#21
I don't think it's the auto calibration.

The screenshot is very strange behavior, I have not seen. Does it do this with both sensors?

I have found a problem that gives bad data from the imu when the ram is full and the kernel is swapping. Not sure how I will deal with this, but it is not normally a problem for autopilot.
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#22
just curious is there something close to the imu, fan, disk drive, speaker or some other EM source that could interfere .
mare liberum
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#23
it would be easy to find out by running the scope on the compass output, then moving the fan wires or other possible sources around.
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#24
(07-29-2018, 08:14 AM)seandepagnier Wrote: it would be easy to find out by running the scope on the compass output, then moving the fan wires or other possible sources around.

No there is nothing around that could disturb the IMU.
The IMU stays stable for a while, and than suddenly starts misbehaving.
   

As you can see on the picture above, it is not only the magnetic compass, but also the pitch and heel.
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#25
I have not seen that, but I have seen sensors with broken axes, and extreme biases.

Could you try a different sensor?
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#26
(07-30-2018, 02:45 PM)seandepagnier Wrote: I have not seen that, but I have seen sensors with broken axes, and extreme biases.

Could you try a different sensor?

I dus. The third one was ok :-)

If you want to investigate it, I can send it to you...
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