Larry M
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  • Santa Clara, CA
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[SOLVED] Need tips troubleshooting EKF errors, log file attached

Started this discussion. Last reply by Larry M Apr 7, 2016. 7 Replies

Hi All,Today's flight felt very unusual.  No crashes, but I frequently felt my quad was behaving strangely. I checked the log file and note that over my 20 minute flight, it threw the error…Continue

Linux autopilot users -- Please help with postmortem

Started this discussion. Last reply by Mirko Denecke Dec 28, 2015. 27 Replies

Hi all,I recently converted my quadcopter from APM over to a Linux autopilot, running a recent version off the dev branch (802ced2).  I'm running a Beaglebone Black using Mirko Denecke's PCB design,…Continue

FM transmitters?

Started this discussion. Last reply by Larry M Sep 15, 2015. 2 Replies

Hi, I'm coming back into RC after a 20 year hiatus, and see that FM transmitters are no longer in vogue. I'm building my own APM quadcopter, and to keep costs down planned on using my old Futaba…Continue

 

Larry M's Page

Latest Activity

Larry M replied to Mirko Denecke's discussion Tested hardware for BBBMINI in the group BBBmini
"Thanks Mirko!  The MavLink_FrSkySPort project looks compelling, which converts Mavlink to FrSky telemetry using a Teensy.  Would it be as simple as connecting this to P7 on your board and calling the executable with -C /dev/ttyO4 ? "
Sep 24, 2016
Larry M replied to Mirko Denecke's discussion Tested hardware for BBBMINI in the group BBBmini
"Anyone know if the BBBMINI is compatible with any of the FrSky receiver telemetry outputs? I notice that some Pixhawk users use an RS232 to TTL converter to talk to the FrSky D and X receivers, and was wondering if BBBMINI could do the same. Am…"
Sep 19, 2016
Larry M replied to Mirko Denecke's discussion I have a BBBMINI PCB / I need a BBBMINI PCB in the group BBBmini
"Hi Linus, The ShenZhen2U site does say they offer V1.5, though the picture is still V1.4.  From the website:"
Sep 11, 2016
Larry M replied to Mirko Denecke's discussion I have a BBBMINI PCB / I need a BBBMINI PCB in the group BBBmini
"It looks like ShenZhen2U is now offering the BBBMINI PCB 1.5 plus headers and CAN transceiver for $9.90 (US) + $4.25 shipping.  They also offer the option to include the sensors for and additional…"
Sep 11, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"I never did get much response on this thread (except for you Micha, thanks!).  I'm guessing that is because EKF errors can be difficult to troubleshoot.I did finally find out what was wrong with my quad.  I'm updating this thread…"
Apr 7, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"Micha, thanks for reviewing the data and suggestion! I'm suspecting a compass issue here too. I'll run the compassmot test to see if interference could be a factor here. I don't have a current monitor, but it looks like there is a way…"
Apr 6, 2016
Micha replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"Ok Larry, i ran your log through Apm log analyzer and you get a lot of  EKF/ Inertial Nav Check ERROR: Bad Variance errors. Read this post:…"
Apr 5, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"I'm going to bump this thread.  I posted a week ago, still stuck and looking for answers!  I'll bet there are a few folks out there with some familiarity with EKF who can tell me what might be going on.  Note: I've had…"
Apr 1, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"EKF position innovations, below. "
Mar 27, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"Incidentally, see plot below for GPS latitude.  The trajectory below is fairly smooth, not much noise.  The delta over the 2 minute time interval was 0.0004 deg, or about 7e-6 radians.  This corresponds to about 44 meters over the two…"
Mar 27, 2016
Larry M replied to Larry M's discussion Need tips troubleshooting EKF errors, log file attached
"Still looking for some tips on how to go about diagnosing the EKF errors.  I'm suspecting a bad sensor, and am nervous about taking my quad out again before I have a good idea on what might be going on.  Here is a screenshot of the…"
Mar 27, 2016
Larry M posted a discussion

Need tips troubleshooting EKF errors, log file attached

Hi All,Today's flight felt very unusual.  No crashes, but I frequently felt my quad was behaving strangely. I checked the log file and note that over my 20 minute flight, it threw the error EKF_CHECK-2 (subsystem 16, error code 2, bad variance) 20 times, or about once a minute.  It would persist for a few seconds to 30 seconds, then go back to normal.  I've never seen this error on previous flights.Also important,  every time I would enter Loiter mode, my quad would start flying in an…See More
Mar 26, 2016
Larry M replied to Mirko Denecke's discussion Discussion about software issues in the group BBBMINI
"I'm curious, is there a way to reliably upgrade the Kernel without reflashing the whole eMMC (as you advise in your instructions)?"
Dec 30, 2015
Larry M replied to Mirko Denecke's discussion Discussion about software issues in the group BBBMINI
"That's great to hear that the official release 3.3.2 supports BBBMINI.  I'll probably stick with the current build I have since everything seems to be working well, and hold out for 3.4.  At some point (when the right amount of…"
Dec 30, 2015
Mirko Denecke replied to Larry M's discussion Linux autopilot users -- Please help with postmortem
"Hi Mike, yes the software howto is rewritten, step 28 is now strep 14. Best regards Mirko"
Dec 28, 2015
Mike Kelly replied to Larry M's discussion Linux autopilot users -- Please help with postmortem
"Just for future readers like myself... Following the link to step 28, it does not exist. Are you talking about step14 the governor settings?"
Dec 28, 2015

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Santa Clara, CA

Comment Wall (1 comment)

At 3:13am on September 22, 2015, Jon Paul Llamas said…

I have 4 BBBMINI no sensors PM me in interested..

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