Hello,
I have two VR cards:
One VR Brain 4.5 with uBlox 6 (3DR GPS) flying an Hexa and one µBrain with uBlox 8 on a smaller Quad.
I upgraded both to latest rc10 version. VR Brain 4.5 is OK (also with EKF) but µBrain GPS performance is poor. Compass calibration is fine. Included is the latest flight log with GPS errors. I had a look at the GPS prediction yesterday and checked the GPS reception with µBrain: it is like there is no GLONASS acquisition.
Thanks,
Marc
Replies
Bonjour Marc,
Thanks a lot for having posted your two flights results on two different quadrirotors ,
one with M8N form VR,
the other with M8N from RTFquad 35x35mm
http://www.rcgroups.com/forums/showthread.php?t=1987175&page=248
Your two flights were successfull
Both of them show INAVERR in logs
As of today we can say all M8N shows INAVERR errors (sometime with max value of 255)
But INAVERR errors have also been seen with 3DR GPS LEA 6H ( with lower values...)
Marc, please specify the Board with the u-blox NEO 8 (M8N ?) you are using. Or we will start to call the Brains just ARM 32 F4, which is only part of the story. I personally own 4 different GPS boards with NEO M8N , one with MAX M8Q, there are probably a lot more designs available. If you own a Reyax825AI, we don´t need to guess whats wrong...All of them you can configure and check via FTDI and u-center (config view), that goes for the GNSS settings as well. Enable GLONASS and GPS, disable BEIDOU and QZSS and save the settings. If GLONASS isn´t set, you should as well check the other settings as well, My proposals are: airborne 4G, ubx out, 38.400,5Hz and SBAS set to EGNOS if you are located in Europe. Although AC is supposed to write these settings itself (if RX pin is properly connected) onto the chipset @ each boot, that might help your understanding.
If its an VR GNSS board with NEO M8N , Roberto or Emile (?) might want to provide a complete setting text (ubx txt), his devs created for proper function. Don´t use the ubx txt created for 3DR LEA-6H (V1.1,V1.2)
PS: I saw some minicopter setups with GPS/GNSS located very low (within copters own interference field), close by "GPS jammers" such as GoPro or even worse Mobius CAM, FPV antennas and telemetry tx...,
All these nearby installed and turned on devices lead to poor reception as well...which is a serious issue with mountings shown here as well... If so, turn of these gadgets, put the GPS onto a Mast and you´ll most probably notice better results.
Hello Gervais,
My NEO 8 is from Virtual Robotix. VR GPS NEO 1.1 (TAOGLASS CGGP.25.4.A.02). I got it with the µBrain. I checked logs from earlier version firmware and I have some logs with 15 sats and a small Hdop.
I have to made an adapter for my FTDI before using u-center. I saw the wiring somewhere (had to find it again).
Thanks,
Marc
Hi Marc! I am having the same problem with my VR GPS M8N and VR μBrain, I have a constant drift to the right but not sure of the problem.
Would you be so kind as to send me the results of his compass calibration?
Offset x =?
Offset y =?
Offset y =?
I want to compare their data with mine to make a comparison.
Offset x = -86
Offset y = -39
Offset y = -7
I did a manual calibration (rotate the copter manually when hooked to computer via USB),
Do not forget Compass_dec
I didn't perform compassmot calibration
Thanks,
Marc