GPS waypoints working! But altitude is way off

naturally was pretty cool to see my arduhexa run a simple flight plan. i used 40 ft for my home and waypoint altitudes, but the heli easily hit 100 ft. quite disconcerting, as it gets small pretty fast. 

 

in all GPS modes, loiter, rth and auto, the heli will climb to about 80 or 100 ft. for example, even if i start the loiter at an alt of 30 ft, the heli will start to ascend. 

 

the pressure sensor on the board is exposed to open air, so would that cause the problem? 

 

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3D RoboticsPermalink Reply by Chris Anderson on August 14, 2011 at 11:00pm
What version of the code are you using?

Yes, you should cover the pressure sensor as shown in the manual (bottom of page):

http://code.google.com/p/arducopter/wiki/AC2Assembly
Permalink Reply by chris g on August 14, 2011 at 11:15pm
IIRC, am using 2.0.38

I previously mounted the boards in a CD spindle case with the baro uncovered. I guess that served the same purpose. I just didn't realize how sensitive the sensor was.

thanks!

3D RoboticsPermalink Reply by Chris Anderson on August 14, 2011 at 11:25pm

Are you using a sonar sensor? If so, is it mounted away from the body, as shown here?

Permalink Reply by chris g on August 15, 2011 at 12:00am
no sonar as of yet
Permalink Reply by chris g on August 15, 2011 at 1:39pm
I covered the baro with some foam and tried a quick loiter. the heli behaves as expected. now just need to adjust the altitude PIDs.

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