Unidentified beep sound

ArduCopter
,
1

My Pixhawk 2.4.8 with ArduCopter 4.2 is suddenly showing a strange behaviour:
When plugging in the battery, Both power LED’s (FMU and IO) light up green, the IO.B/E LED light up orange and the IO.ACT LED slowly blinks blue. Then, for about a minute and a few seconds, nothing happens. Then, The Pixhawk emits the following beeping code:

https://www.dropbox.com/s/axdk3njiae06qp1/Beep.mp3?dl=0

I checked the sounds here and here, but couldn’t find that particular code.
After all that, the startup progresses normal.

Everything was working normal. The last thing I remember was starting the ESC calibration via Mission Planner. When I unplugged and reconnected the battery, this behaviour occured.

I swapped out this Pixhawk for a spare one which works, but I really like to know what happened here.

Thanks in advance.

2

that just sounds like esc calibration mode. you set it to esc calibration mode, then when it restarts it goes into esc calibration mode.

https://ardupilot.org/copter/docs/esc-calibration.html#semi-automatic-esc-by-esc-calibration

3

No SD card sound, may be.

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4

And that’s the solution. I did have an SD card in there of course, but it was broken. Replacing it with a fresh one, everything is back to normal again. Thanks a lot!
I completely forgot there even was an SD card in there. I should have checked that first. SD cards usually already break when you look at them too stern and this one was quite old.

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