Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on December 3, 2011 at 10:04pm

You should be using the latest software, BTW: ArduPlane is now at 2.26

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Permalink Reply by Rigel on December 3, 2011 at 11:57pm

Ok Chris, I'll do that. 

Is the airspeed sensor problem a past issue that has been worked on and fixed in the new code?

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Permalink Reply by Rigel on December 3, 2011 at 8:47pm

Michael,

I just did a flight with the airspeed sensor disabled and it worked fine :o)  However the thing was still a real rocket at times.  Attached is the log of this flight.

So apparently the nose down and over-speed issues were caused by the airspeed sensor as you suggested.  With the sensor enabled, I still don't get why it would keep diving and pick up speed if the indicated airspeed on the HUD is way over the set speed.  Any ideas on how to fix this issue?

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DeveloperPermalink Reply by Michael Oborne on December 3, 2011 at 10:05pm

Rigel,

 

you should be changing the throttle cruise and airspeed cruise values for airspeed.

also check what are your throttle min and max's?

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Permalink Reply by Rigel on December 4, 2011 at 12:06am

Michael, I have.  I've set throttle cruise to 40%, and max to 90%.  Cruise airspeed is at the default value but I've changed FBW max to 19m/s in the hopes of slowing it down a bit.  I'm not sure if this has any affect in Auto mode though. 

Is the airspeed sensor problem a common issue?  I'm just curious because I crashed my first drone twice on two separate APMs and lost it on the second crash.  It's a little frustrating to see this same issue come up again on my third APM.  On the first airframe I had the probes sticking out at least 2 inches from the leading edge of the wing and now I have the probes sticking out of the cockpit into what I believe is fairly good air. 

What I really don't get is the nose down attitude when indicated airspeed is so high.  Any ideas?

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Permalink Reply by David Meszlenyi on December 16, 2011 at 6:26am

Hi,

I know that this question should be posted into another topic but I couldn't find such one.

Could anyone tell me what the MAV_CMD_DO_REPEAT_RELAY command stands for?

Many thanks in advance!

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3D RoboticsPermalink Reply by Chris Anderson on December 16, 2011 at 8:33am

That refers to the Relay on the APM 1 board.

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Permalink Reply by David Meszlenyi on December 16, 2011 at 11:42am

Thanks for the answer!

We already use the DO_SET_RELAY command for image taking but this way too many images are taken.

So an image in every 2nd or 3rd second would be enough but there is no command for this. We guess that the DO_REPEAT_RELAY turns on the relay with the predefined time value (sec) and switches it off. Please correct me if I were wrong!

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