Replies to This Discussion

Permalink Reply by Richard Boyhan on March 4, 2013 at 7:29am

Before you try loiter or RTL, you need to see if altitude hold works. All advanced flight modes use altitude hold as a base. With RTL, the copter should climb to 15 meters and return to launch point. You must have GPS lock for RTL to work. Leave sonar off, it is not needed for altitude hold.

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Permalink Reply by Les M on March 4, 2013 at 10:11pm

Thanks Richard,

I have tried Alt-hold as well but same thing, takes off like Apollo 11 :-)  Do you any idea why my altitude in the flight planner is negative? Dumb question, but that isn't normal is it?

Thanks,

Les

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Permalink Reply by Les M on March 4, 2013 at 11:20pm

No I don't have it cushioned (face palm to self). I will give it a try on Friday when I'm back home and give it another go.

Thanks for your help Paul & Richard, appreciated :-)

Les

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Permalink Reply by Pierre Seguin on March 8, 2013 at 5:29pm

I have had the same problem with one of my APM. after contacting Diydrone I was told the noise was within the specs and they offered to give me 50% discount with restriction attached for a new board. So I did not reply to their offer. I can post the exchanged email if you whish Pierre

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Permalink Reply by Alex O. on March 11, 2013 at 7:40pm

@ Paul Hansel. I did this test. In my case, I had to type "altitude" after the "test" command. "airpressure" is not recognized as a command...

I didn't see any negative value. So hopefully my baro sensor is functioning okay. I haven't tested the "alt-hold" yet.

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Permalink Reply by Colton Wingard on March 11, 2013 at 8:39pm

once i swapped out the material that was covering my baro sensor the altitude hold worked perfect .

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Permalink Reply by Colton Wingard on March 9, 2013 at 8:52am

did anyone ever answer about the negative altitude because i myself have the same problem and would like to know.  Mine also shoots off like a rocket but i also have mine covered.  Will find out after i run the baro test..

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Permalink Reply by Ted Van Slyck on March 7, 2013 at 11:28am

I crashed in some snow today and the APM got wet. I dried it out and when I plugged into Mission Planner I noticed the altimeter was showing something like negative 2 million. I did the CLI test altitude and it was outputting normal numbers, +/- a few centimeters.  So I erased EEPROM, reloaded 2.9.1, and re-input my config settings and viola!  Fixed. Maybe a drop of water got on my baro and I needed to reset things after that egregiously bad data? Not sure

Ted 

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Permalink Reply by Les M on March 9, 2013 at 4:56am

Hi Guys,

Tried putting the APM on to a foam pad, also loosen'd the wires going to it. Checked that the foam block is inside the APM (yes it is). Result is I took it out today and it performed absolutely the way it should. Alt hold, loiter and RTL performed really well except vert landing speed in RTL is a bit slow...

Thanks HEAPS for your help everyone!!

Les

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Permalink Reply by Waladi on March 11, 2013 at 9:02am

Hi Les,
Can you share the picture of your foamed APM?

Thanks.

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Permalink Reply by Les M on March 12, 2013 at 2:46am

Here's 2 pics of the APM mounted on the foam. I actually used concrete expansion joint for the foam ;-)

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Permalink Reply by Alex O. on March 12, 2013 at 5:39pm

I am having a hard time to understand what a foam pad has to do with altitude hold function.

Foam pad will eliminate any unwanted vibration; that's understandable but how does it help with the altitude hold?

Does the barometric sensor vibration sensitive?

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