Altitude of quad is puzzling...

I've attached an image of the quad I'm working on. Also, I've attached an image of the Rel Alt and Alt fields of a recent flight of the quad. When in loiter, the quad does not seem to be following my commands. I'm not sure if this is a basic problem with barometer, or there was something wrong with my initial calibration. If a log file is needed to narrow this down, I'd be happy to supply it.

Any thoughts?

APM 2.6, uBlox GPS

alt.jpg

quad.jpg

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  • Even though I performed a Compass/Mot calibration (successfully), I thought that perhaps there might still be an EMI issue with the motors and ESCs. 

    So, I installed a capacitor onto one of the spare outputs of the APM. Now, I have a working quad. I've attached images of the GPS RelAlt logs and the BARO Alt logs with and without the capacitor.

    If anyone has any insights, I would be happy to hear them. I was somewhat leery of adding the capacitor onto the APM outputs as a result of negative experiences of others, but adding the capacitor seems to have calmed this quad down.

    no_cap.jpg

    with_cap.jpg

    https://storage.ning.com/topology/rest/1.0/file/get/3702081425?profile=original
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