Internal Compass error

DROPIX
#1

I have constant compass errors on the dropix internal compass. After several calibrations the compass values are still red.

First question - what should be set as orientation (AHRS_ORIENTATION) for the dropix board?

To be able to fly i have disabled the internal compass and just use the external one from the
Ublox NEO-M8N GPS + HMC5983 compass module.
This worked quite well but still EKF compass errors at every flight.
I guess it’s to the crazy configuration since i’m draining nearly 160A current at 100% throttle.
Any ideas on how to improve the compass issue?

Some pictures of the setup




Thank you, Gerald

#2

Try to remove the Dropix from the power module to decrease the pertubations.
Let me know

#3

Hi Jerome,
due to the construction of the frame body i can mount the Dropix on top of the PDB only. All the standoff’s are Nylon and i have connected the shielding plate between the Dropix and PDB to GND (made some scratches into the board on one side and soldered a wire to GND on the PDB). Also the CFK frame is connected to GND to reduce electromagnetic interferences.

#4

Can you try to put longer standoff between GPS and Dropix please?
Just to see if it’s the problem.

#5

i increased the lenght of the standoffs already from 10 to 15mm and that helped for the external compass on the GPS board.
I think the interference issue on the internal compass i cannot solve due to the frame design.
I will try to improve the shielding below the dropix FC further or simply keep the internal kompass being swithed off.

Thank you!

#6

ok let me know. Good luck!

#7

Thank you. I will let you know my findings.

#8

No progress made on my side so far… have build 3 other race copters in the meantime that are flying well (the ones at the left side)

profile_bgnd.PNG1020×261 250 KB

I was flying the Octo-Monster at an event up to 123km/h but have started a rebuilding activity recently. New motors, new PDB and relocation of GPS within the frame to saveguard GPS signal beeing ok when flying with ~75° pitch forward. I hope i can solve the magnetical interference with some of the modifications i have in mind e.g. Coax cable (self made) between PDB and ESC.

#9

Nice. Keep the good work!