Unreliable barometric altitude (Arduplane 2.30)

Just got into this about 2 weeks ago, and really enjoyed it.

It is so much fun! :)

 

But today I experienced this pitch down and dive hard unexpected movements that my plane made.

I took off 3 more times, everything seamed ok, in the begining, but suddenly it happened again, and again. Luckily i did not crash.

 

Then it was time to check the logs. And i saw this. 6000m???!!!

 

Have you experienced such a thing?

 

3690922563?profile=original

 

 

 Please help.

At this point, i can not trust my APM anymore.

And it does feel bad. :( 

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Did someone had problems with your APM1 barometric sensor BMP085? My one is providing a strange measure of 116353 for the GND_ABS_PRESS and 2200 deg for temperature. To check this I used the barometer test code at ArduPlane2.34\libraries\AP_Baro\examples\AP_Baro_BMP085_test\AP_Baro_BMP085_test.pde
    the value of 116353 is higher than 101325.0 producing a number higher than 1 in the calculation.
    I tested it byusing the APM Planner test option airpressure that shows the same value for GND_ABS_PRESS and 220 for the temperature.

    Hi,

    I replaced the IMU board to other I have and the readings are then 91754 for GND_ABS_PRESS and 20 deg for temperature. So with this other IMU it is workin ok as showed by the test program as well by the Planner test option and HUD.

    To my APM to work with that IMU having this faulty sensor I replaced de mix from 0 to 1 to use GPS only for altitude.

    It is common to this BMP085 sensor to be faulty? Did someone have similar problem?

    regards,
    Omar

  • Developer

    I've just pushed out ArduPlane 2.31 to fix this bug. Thanks to Randy for the fix!

    Cheers, Tridge

  • Randy , could you please comment on how this is possible ?

    bad GPS fix, gives me realistic,changing altitude with a huge offset.

    http://youtu.be/LhRxeRjXG5Y

  • Developer

    I know what this is and it's my fault.  It occurs when the raw pressure from your barometer crosses 32.7 degrees while in flight.

    There's a problem with the barometer filter in 2.5 arducopter and 2.3 arduplane.  We just found and fixed it and this went out in 2.5.3 of arducopter yesterday but I forgot that 2.3 of arduplane had the same bug.

    I'll talk to tridge and see when we can push out a fix.  Sorry about this.

  • check that you have good GPS fix -

    GPS altitude is not used by default - (as far I can see from the source)

    Still I've seen my plane at 7000m for several minutes, after bad GPS (lost fix) - while real altitude was ~100m.

    This is very dangerous - in case of lost GPS fix in this case, the plane would descend until it meet terrain if it was in any AP mode..

This reply was deleted.

Activity

DIY Drones via Twitter
RT @MarvelmindMaxim: Extreme precision for 60 swarming robots. #marvelmind #autonomousrobotics #robotics #swarmrobotics #rtls #ips #indoor…
23 hours ago
DIY Drones via Twitter
RT @MarvelmindMaxim: Precise (±2cm) tracking for racing boats and autonomous boats. Works outdoor and indoor. #autonomous #AutonomousVehic…
23 hours ago
DIY Drones via Twitter
RT @MarvelmindMaxim: Helping PixHawk folks to fly autonomous quadcopters using PX4 and ArduPilot. https://marvelmind.com/drones/ Equally suitab…
23 hours ago
DIY Robocars via Twitter
RT @chr1sa: The @DIYRobocars @donkey_car virtual AI car race is starting in 15 minutes! Watch it live on Twitch https://www.twitch.tv/mossmann3333 htt…
Saturday
DIY Robocars via Twitter
RT @chr1sa: Don't miss our monthly @DIYRobocars @donkey_car virtual AI car race tomorrow at 10:00am PT live on Twitch. Head-to-head racing…
Friday
DIY Robocars via Twitter
RT @sparkfun: Our completed tutorial on building an @NVIDIA Jetson Nano-powered @Sphero RVR gets your bot up and running via teleoperation…
Thursday
DIY Robocars via Twitter
RT @SmallpixelCar: Freeway test https://t.co/4V5tV9lhIP
Thursday
DIY Robocars via Twitter
Very small autonomous cars racing, thanks to an overhead camera: https://control.ee.ethz.ch/research/team-projects/autonomous-rc-car-racing.html
Wednesday
DIY Robocars via Twitter
Wednesday
DIY Robocars via Twitter
Jul 29
DIY Robocars via Twitter
RT @chr1sa: Don't miss our virtual AI car race this Saturday! Real developers + virtual cars =🏎️🏎️🏎️ Head-to-head battles with thrills, sp…
Jul 28
DIY Robocars via Twitter
Jul 27
DIY Robocars via Twitter
RT @usashirou1: Jetson nano by Isaac Kaya #jetson https://t.co/Mu1N0CyQkN
Jul 23
DIY Robocars via Twitter
RT @GPUsolution: JetRacer mady by Iflytek company #JetsonNANO #Nvidia https://t.co/MimTymIwge
Jul 23
DIY Robocars via Twitter
RT @openmvcam: I love this: Mega or Mini? Image Classification on the 1MB OpenMV Cam H7 by Ish Ot Jr. in OpenMV, Edge Impulse, Internet of…
Jul 23
DIY Robocars via Twitter
RT @RoboticMasters: This is looking pretty good... but still needs a bit more refinement. Pure OpenCV Turning Sign Detection. No Tensorfl…
Jul 23
More…