Since v3.2.3 our Pixhawks are making a doh-re-me sound at rest, there are no warning messages and I can't find any info on what these tones mean? It is intermittent and irregular.

Attached is the sound

Any ideas?

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Thanks Grant, much appreciated. Now we know.

Yes we discussed at t

Hey there! I am getting a do-re-mi sound as well and I don't know what it means (throttle is not coming on as planned as well, but my servos are working decently). I don't understand what all the code is about (is it c++?) but I can't seem to get my plane to arm. Did changing the RC3 settings help at all?

https://www.youtube.com/watch?v=s8qXUC-hfFk

Throttle won't work until you arm the plane.  Arming is on by default.  Firstly you need to press the safety switch so it stops flashing.  Then you usually need to hold right rudder on your TX and you will see on the GCS that it will change from disarmed to armed.  Then your throttle should work.

Thanks, Grant.

Right. In the video I posted above, you can see me pressing the switch on top of the aircraft (you can see that it is a solid color, not flashing...), and that allows me to move my servos and should also allow me to move my throttle. That is the say it worked on a previous version of the same airplane. So I held down the safety switch, and that produced the Do-re-mi sound that you hear in the video. I then move the sticks for the servos, and they all move. Only the throttle doesn't work.

OK, so assuming that your directions are correct: After I press the safety button and "arm" the plane (still hearing the do-re-mi sound), I hold right rudder on my transmitter for a few seconds (1-10 seconds), and that will THEN allow me to throttle up and down. Is that correct?

I am asking for clarification because I have never had to "hold right rudder on my transmitter" for the throttle to arm...

In the last release of Plane we made throttle arming default to on.  Its in the release notes which can be seen here.

http://diydrones.com/profiles/blogs/apm-plane-3-3-0-released?xg_sou...

Pressing the safety button is the first of 2 steps.  The second is now the throttle arming.

Thanks, Grant.

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