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Hi, I have problems to calibrate the external 3dr compass with my pixhawk.

Using Mission planner l select Pixhawk/PX4 and try live calibration.

I see for compass 1 and 2 error 99 and never more then 3 samples are collected.

The behavior is very similar to this one

http://diydrones.com/forum/topics/pixhawk-compass-calibration-does-not-work

A little bit more story.

First I bought a pixhawk together with an external 3dr GPS/Compass.

With this compass I could calibrate with no problem and GPS was also working.

But the compass seems to have an issue. When the pixhawk was running a while (e.g. > 10 minutes) the heading began to turn around faster and faster over time.

I calibrated the compass many times but this behavior always came back.

So I send it back and got a replacement.

Here I want to notice that the shipped 6 pin cable for this new GPS/compass for gps was a 6 to 5 pin cable.

I was a  little bit wondering and used instead a 6 to 6 pin cable.

With this new module live calibration isn't working.

I couldn't believe that this new module is not working and bough an additional module (which was shipped also with 6 to 5 pin cable).

Unfortunately this 3rd module is now also not able to be calibrated.

So what going on here???

I tried many things including flashing new firmware to the pixhawk, replace the I2C cable, replace the GPS cable but with no success. (calibrating the pixhawk internal compass works).

I also checked the pixhawk I2C supplied power and measure there around 4,7 V. Is that normal?

Could it have to do with a bad batch of these 3dr modules?

I bought them in Germany and because my both last modules were shipped with this wrong 6 to 5 this could be the case? Or it's me causing the problem? :)

Any hint what I can try to get it to work?

I'm really disappointed!

Cheers

Pat