"Slow sampling would not remove the noise. Slow sampling with additional filtering would. So if the slow samples are sctually averages of 20 samples, or some other filter technique, then you would see the noise drop. Did you happen to sort this out…"
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Dave Whittington
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Dave Whittington's Discussions
Anyway to download the 2.6.8 ArduPilot Firmware
Started this discussion. Last reply by Dave Whittington Feb 13. 3 Replies 0 Likes
Just so I could have the actual binary that gets downloaded by Mission Planner, I would like to have the Arduplane 2.6.8 Firmware - not the source. Any place to get it?Continue
Any way to disable popup confirmation question about disconnect during moving?
Started Jan 8 0 Replies 0 Likes
Michael, I get the popup confirmation question (Do you really want to disconnect while moving?) when I am doing many tests during a one-hour flight. I just want about 30 to 60 seconds for each…Continue
APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft
Started this discussion. Last reply by Cliff Gill Feb 4. 13 Replies 1 Like
I have been using an APM 2.5 in an actual aircraft connected to my laptop running Mission Planner just for recording pitch/roll/yaw and comparing it to the "gold standard" G1000 logged data while…Continue
MP 1.2.25 on XP using USB (driver is atmeaga2560.inf) says "Comx doesn't exist"
Started this discussion. Last reply by Dave Whittington Dec 14, 2012. 10 Replies 1 Like
Tried the latest (1.2.25) Mission Planner on XP 32 -bit, made sure the atmega2560.inf driver was installed (Device Manager says it is there), fired up MP and tried to connect. It shows "(COM5)…Continue
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brian replied to Dave Whittington's discussion Comparison of xgyro, ygyro with rollspeed, pitchspeed which are extremely noisy
Dave Whittington replied to Dave Whittington's discussion Anyway to download the 2.6.8 ArduPilot Firmware"Nor do I know how to download the hex - github - don't know
Dave"
Dave Whittington replied to Dave Whittington's discussion Anyway to download the 2.6.8 ArduPilot Firmware"@chris,
Thanks for the info but I can't see how to discern which is Arduplane 2.6.8.
Dave"
3D RoboticsChris Anderson replied to Dave Whittington's discussion Anyway to download the 2.6.8 ArduPilot Firmware
"The hex's are all in the GitHub repository.
https://github.com/diydrones/binary/tree/master/Firmware"
Dave Whittington posted a discussionAnyway to download the 2.6.8 ArduPilot Firmware
Just so I could have the actual binary that gets downloaded by Mission Planner, I would like to have the Arduplane 2.6.8 Firmware - not the source. Any place to get it?See More
Dave Whittington commented on Chris Anderson's blog post Great ABC News profile of Jordi"Jordi,
Congratulations!! You have been successful in your technical endeavors but more importantly, you have shown us all how to be an entrepreneur - starting a business and hiring a great team! When I visited your facilities in…"
Cliff Gill replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"I have also tried this several times over the years. A year ago I tried this with an old version of apm and it worked poorly. I just tried again with 2.68 and it worked pretty well, although not perfectly. I had no reference ahrs to compare, but…"
Dave Whittington replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"Ralph,
Here is 60 seconds of roll and pitch data for the APM and the G1000. I also included the rates for the APM.The far right columns are the G1000…"
Dave Whittington replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft" I just wanted to report that using APM firmware 2.6.8 and AHRS_GPS gain of .5 and AHRS_RP_P gain of .2, I got much better tracking with G1000 data. The size of roll and pitch excursions when maneuvering at 30+ degress was much better -…"
Dave Whittington replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"
I have included some quick plots of the difference between APM and G1000 data - just focus on the BLUE pitch data traces"
AlanGP replied to Dave Whittington's discussion Pitch and Roll are noisy (+- 1 degree) with new LEA-6 Ublox"Hi,
Just a guess but it might be due to the increased sensitivity of the u-blox over the "older" GPS.
Alan"
Dave Whittington posted a discussionAny way to disable popup confirmation question about disconnect during moving?
Michael, I get the popup confirmation question (Do you really want to disconnect while moving?) when I am doing many tests during a one-hour flight. I just want about 30 to 60 seconds for each TLOG file so that when I run them through EXCEL later, I have a separate file for each test. It is troublesome to answer that question (have to move the mouse cursor around) - any way to disable that in a config file? Thanks much for your tremendous effort - we have very professional tools! DaveSee More
Dave Whittington replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"@Ralph Paul and Soren,
Thanks very much for your expertise in trying to understand what I could do to make the APM pitch/roll attitude performance better! I am starting the APM with it level on the ground and disabling any further level…"
Ralph Paul replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"Hi,
the gyros of the APM unit (MPU6050) are low grade and cheap. Invensense doesn't even provide data on "bias instability" in their datasheets nor advertise them for attitude heading reference purposes (unlike their new MPU3300 gyros…"
Søren Kuula replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"Hi,
That's OK :)
I think it is a common shortcoming of most / all but the most advanced IMUs that they get confused in long accelerations or when moving in circles.
Maybe if you know an IOS developer, you can ask him to put "that 3D teapot…"
Dave Whittington replied to Dave Whittington's discussion APM2.5 ( Ardupilot 2.6.5) IMU - Poor Orientation Results in Actual Aircraft"Thanks Soren - sorry I didn't back to you sooner - Christmas and grandkids and all that. I will try reducung that parameter but I have a suspicion that it really isn't working well for any Arduplane - it's just that it is difficult…"
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- I have 30 years experience with flight simulation at Boeing and have flown RC planes as well
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Comment Wall (1 comment)
- At 6:13pm on September 29, 2012,
William Premerlani said… Hi Dave, Good question about determining angle of attack and side slip from available data. It would be easy to do if the wind were zero, but the wind is going to make it tricky. You need to know the wind accurately. My wind estimation algorithm assumes zero angle of attack and side slip, so in steady state, I think if you tried to compute side slip and angle of attack, they would come out to be zero. You might be able to determine sudden changes in the angles.
I will give it some more thought, if I come up with anything, I will get back to you.
Best regards,
Bill
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