Magfit and Li-ion pack

ArduCopter
1

Hi all.

Can anyone help me with advice regarding Magfit and LI-ion.
I have calibrated the compass and flown some test flights. The machine flies well and I see no problems but when I check the values ​​in Magfit I get worried.

Regards //YB

2

How much separation do you have between the battery and compass?

3

Hi Geofrancis

The separation from top of the li-ion pack to the mid of the GPS is 200mm. The li-ion pack orientation is battery poles to the side.

4

How big is the machine and battery?

5

The machine is 850 mm and battery is 6S4P, 14000mAh

6

what values ​​in Magfit are worrying you? have you done the calibration

7

Regarding the battery orientation, when i run Magfit tool I can se different result depending the battery pack orientation ?

8

yes, you can, it changes quite a lot.

9

Hi amilcarlucas.

what could be the best li-ion orientation relativ the compass ?

10

You need to test, depends on the battery pack and the compass.

11

The best battery orientation gives the smallest mean field error if I understand it correctly?

//YB

12

This is the first time I do the compass from the flight log calibration with Magfit and I want to feel sure what I’m doing. I have adjusted the COMPASS_OFS values and am now waiting for the rain to stop. Thanks so much for the help.

Regards //YB
13

I have used this Magfit tool with the same file, same segment, same settings and get results that are seemingly random. Clicking the Calculate button most often zeros the compass_motor values. A colleague gets yet another set of variable results with her laptop. It is likely operator error, but has eliminated any confidence in numbers produced. I have read documentation and viewed videos on use of the tool and think I’m following the defined procedure. I wonder if others have experienced this difficulty? Is there another web based tool that could make this easy. The tool i am refering to is: ArduPilot MAGFit

14

Magfit Tool in MavExplorer. Not Web based.

15

I would love to have a non-web based tool that can do a regression on my log data and give me corrections that include the Compass_mot slopes. Can you provide a link??

16

Mavexploere
Wiki

17

Thank you Dave! I will give this a shot.