Alt hold problems

Flew for the first time in a while this morning, my first test of 2.2. I ran into an issue where in ALT_HOLD mode at low level the quad would gradually sink into the ground. From memory I had this issue with other FW versions too, so it's probably my setup.

Looking at the logs (see attached, it actually logged this time!) I can see why. The sonar input is all over the place. I don't understand why though. I have a shielded sonar cable, and everything works fine when testing in CLI.

Any help would be appreciated.

Cheers,

Chris

2012-01-29 10-26 6.log

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  • 3D Robotics

    Are you using an Xbee? They can interfere with the sonar. See if you can mount them further apart. 

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