"I decided to give ArduCopter a next chance. Loaded latest MP beta and latest AC 3.4dev today, then V frame selected, then compasses calibration (all axes green values), then RC calibration - RC1-4 from 100 to 1900. Then started ACC calibration:…"
"This is really strange. I don't suspect my board is affected because I can calibrate Accel in AC stable/beta 3.3.4 version, also PX4 stack calibration is working fine. I'm a noob user only but there is for sure something suspicious in AC 3.4dev…"
"Michael, you seem to be a lucky man :). I use MP 1.3.37 build 1.1.5960.18090 and latest 3.4 dev build from today. Accel calibration is not possible. Getting always "Calibration Failed" message and after that HUD display is dancing with message:…"
"This is strange. I'm only able to calibrate accel if using latest available beta file for Pixracer, if I'm right this is ArduCopter-v4.px4 file generated on 2016-02-25 at 01:38 with size 611K.
Any newer ArduCopter-v4.px4 file from master branch does…"
"Hmm.... I'm stupid. I have tried now AC3.3.4-pixracer version loaded from MP screen. I see now that firmware is PX4v2 and MP top bar shows V3.3.4-pixracer. And now I was able to calibrate accel :).
But I don't see now for example MOT_PWM_TYPE option…"
"Found "Vehicle 200" or "Getting Params 200" reason. It was OSD board (AlceOSD) connected to Pixracer Serial 2 (Telem2) port (at the front of the FC). I have tried to make an accel calibration after disconnecting OSD but same bad result - calibration…"
I have some serious problem with accel calibration on my Pixracer with loaded latest AC3.4 master. I can't calibrate accel. The message is "Calibration failed", nothing more. I have tried with Mission Planner (USB, WiFi), Tower (WiFi), QGC…"
"If I look on a "dot" located on the compass module, the dot is placed in left bottom corner - GPS oriented like on the picture I provided. Also, saw some post on Drotek forum. I hope it is correct. Anyway, need some confirmation that my MP compass…"
"I was a bit confused reading your previous post but now everything is clear regarding version.
Regarding accel calibration, I will do this step at the end, doing first RC, compass, etc, and see what will happen."