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IRIS+ hovered in Loiter mode, FailSafeBatt-1 triggered, copter climbed and crashed

June 3, 2016, 10:45 am
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@Vusal_Jalilov wrote:

1) Describe the problem you are having. What is the expected verses the observed behavior?

I was simply loitering IRIS+ approximately 4 meters above ground. I expected failsafe battery to trigger LAND, because FS_BATT_ENABLE was set to 1:LAND. Instead, the copter climbed approximately to 20-30 meters and flew away from Home location, then crashed.

Even if the copter would specifically RTL, (as noted for the FS_BATT_VOLTAGE) then it still should have landed at the same location anyway, as it was ARMED their, instead, as noted above, it flew away from RTL location.

The moment it climbed up I did switch CH7 ON to force Land, but it didn't help.

I was having issues with compass and then accelerometer calibration, but I re-calibrated everything from scratch and had no Pre-Arm Errors.

2) Provide hardware information such as the brand and version of your autopilot, GPS, radio, and compass, as well as any other pertinent details about your setup.
3DR Iris+, Pixhawk/PX4, 3DR UBlox GPS + Compass Module, 2.4Ghz FrSky D4R-II 4 Channel Telemetry Receiver and FrSky DJT Telemetry Transmitter, 433 Mhz 3DR Telemetry Radio for Tower (was connected when crashed)

3) What version of the APM:Copter firmware version are you running?
APM:Copter V3.3.3 Quad (acf2e10c) installed from Mission Planner 1.3.37 build 1.1.5917.13431
Frame Type: V, 3DR_Iris+param

4) For flight issues, provide your dataflash log.
TheCrashLog

Auto Analysis shows the following:

Log File C:/Users/vusal.je/AppData/Local/Temp/tmp7F6E.tmp.log
Size (kb) 5888.9365234375
No of lines 72399
Duration 0:07:56
Vehicletype ArduCopter
Firmware Version V3.3.3
Firmware Hash acf2e10c
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = NA -
Test: Balance/Twist = NA -
Test: Brownout = GOOD -
Test: Compass = FAIL - Large change in mag_field (49.27%)
Max mag field length (590.26) > recommended (550.00)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERRs found: FS_BATT CRASH FS_THR
Test: GPS = GOOD -
Test: IMU Mismatch = FAIL - Check vibration or accelerometer calibration. (Mismatch: 3.45, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -

Looking forward to getting any clarifications that caused the crash.

Regards,
Vusal

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Stick controls wonky after yawing hex when in loiter

June 3, 2016, 12:44 pm
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@davyg wrote:

I took my hex out tonight and did the auto tune, flew it a little while and all was working good... all flight modes worked fine, Loiter was rock solid... it was only when I yawed the hex to the left and attempted to fly it forward...all the controls were totally screwed up... backwards was to the right, starboard was ahead etc,etc... I switched to alt hold and stab mode and all controls worked fine... would say that something isn't working as it should..... but I have no idea what!!!

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FG button not Found in simulation Tab in MP!

June 3, 2016, 1:28 pm
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@ahmed wrote:

Hi all ,

I wanted to use flightgear to simulate my mission , I read the documentation web page ,
but it explane steps that I didn't find in the mission planner such as ( Start FG Plane ) button
it's not found in MP even they show it in picture in the web .

missionplannersim.jpg705x540 36.6 KB

http://ardupilot.org/dev/docs/flightgear-hardware-in-the-loop-simulation.html

http://ardupilot.org/dev/docs/x-plane-hardware-in-the-loop-simulation.html

until now I couldn't get the simulation work ,
How I can Make it work ?

Suggestion

Some of the topic explanation is not clear.
If you prepare video explanation for some topic , will be more useful and easy for users .

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Guided takeoff causes crash when R/C is off

June 3, 2016, 1:40 pm
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@rrr6399 wrote:

I've documented the problem here:


but wanted to spur on more discussion.

It appears that if you have a R/C receiver that does not send the last know R/C PWM levels for yaw, pitch and roll and the R/C is turned off, the 3.4 firmware will take 0 for yaw as maximum yaw left (and likely max roll and pitch) upon using guided takeoff.

The work around right now is to keep the R/C turned on even if you are flying the copter with a GCS.

I'd expect the copter to use the mid-stick values (1500 for yaw, pitch and roll) if they are all set to 0 PWM. Throttle should be set to 1000 (or min-throttle) if there is not input for non-automatic modes.

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Problem with Absolute Altitude near the meridian of Greenwich

June 3, 2016, 2:43 pm
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@SergeB wrote:

Waypoint created with MissionPlanner near the meridien Greenwich never have the absolute altitude. Exactly beetwen the longitude 0 degree and 1 degree EST.
Files as N48E000, N49E000 ... are not loaded in the srtm directory of MissionPlanner

I looked to the code and I think that le problem comes from the srtm.cs file,
in the :
"public static altresponce getAltitude(double lat, double lng, double zoom = 16)" function,
at the line 83 of srtm.cs
The code :
string ew;
if (x > 0)
ew = "E";
else
ew = "W";

would be :
string ew;
if (x >= 0) // Change is here.
ew = "E";
else
ew = "W";

I compiled and the code works correctly.

The same problem comes with Latitude, near Equateur. Line 77 of srtm.cs
The code :
string ns;
if (y > 0)
ns = "N";
else
ns = "S";

would be :
string ns;
if (y >= 0) // Change is here
ns = "N";
else
ns = "S";

I hope to have helped little.

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APM 2.6 Input channel 1 dead?

June 3, 2016, 4:06 pm
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@Reggie_Dipo wrote:

Hello,

Did anyone experienced input 1 from receiver (reciever it self works OK i checked) not working at all I reflashed firmware and was calibrating radio in Mission planner twice and both times the same result no reaction from channel one when i move radio stick. I opened APM 2.6 and I dd not seen any soldering faults from a quick look.

Any help would be apreatiated.

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Companion: Pi 2/3/Zero

June 3, 2016, 9:40 pm
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@benbojangles wrote:

Technical, Code and Hardware questions

If you are having issues with Companion: Pi 2/3/Zero development, and would like to discuss code solutions please post your topics here so other developers can assist and provide ideas. Afterall Companion: Pi 2/3/Zero is a new project with a finished idea - it is being developed with project goals that have yet to be implemented.

Basic project chat here:
http://diydrones.com/forum/topics/companion-pi2?groupUrl=companion_computers&xg_source=activity&groupId=705844%3AGroup%3A2180430&id=705844%3ATopic%3A2238641&page=1#comments

Github repository here:
https://github.com/benb0jangles/Companion-Pi

Best wishes and good luck with your adventure!

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Pixracer WiFi with mission planner

June 4, 2016, 7:05 am
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@douxyeti wrote:

Can someone confirm if WiFi connection works with pixracer and mission planner? I can connect to the pixracer WiFi module but mission planner just keep waiting for UDP connection. I read all the pixracer posts on the old forum but got lost as to working or not.

My hat to the developers and the beta testers....great job.

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Using AeroSIM RC with Mission Planner

June 4, 2016, 8:12 am
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@rbuav wrote:

Hello all. I am working with Florida State University on linking Mission Planner and AeroSIM RC as part of their emerging UAS in Emergency Management program. I found information in the Wiki on setting up the MP simulator with FlightGear and X-Plane but not AeroSIM. I see it as an option but the only instructions I can find on the web are outdated and a bit cryptic (https://code.google.com/archive/p/ardupilotdev/wikis/HILTestAeroSIM.wiki). I've seen a few videos on YouTube so I know it's being done on a more current version of MP than the web instructions referenced above. None of the authors/creators have responded to a request for more information. Any help would be greatly appreciated. TYVM!

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Same prop broken every flight Im done with it plz help

June 4, 2016, 9:03 am
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@Sjuriyan wrote:

Hi my Quadcopter sk 450 frame
Pixhawk fc
750 kv motor

My problem is weird !
Almost every flight one of my prop broken
The weird thing is
The broken prop always Same motor (back left) other motors never broken and every time IT CUTTING FROM SAME PLACE EXACTLY!! 2sm from the hub

I try to change the prop adaptor but that didn't fixed my problem

I am very nervous because i don't know the reason

I can confirm that my prop didn't touch anything

What do you thing the reason of my problem?

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EKF warnings during flight on 3.4-rc1

June 4, 2016, 11:49 am
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@kosmik wrote:

I had a number of flights today on 3.4-rc1. It was slightly windy day, maybe 5m/s. Everything worked fine, but I did get EKF warnings during flight.

I have a custom MinimOSD which shows me warnings when any of velocity_variance, pos_horiz_variance, pos_vert_variance, compass_variance or terrain_alt_variance are at or above 0.5 and 0.8 (from MAVLINK_MSG_ID_EKF_STATUS_REPORT message).

At some point I've got a first-level warning (>=0.5) and then after some time a second-level (>=0.8) one, after that it disappeared.
Is it something I should be worried about? I have EKF2 enabled.

Here is my log: https://onedrive.live.com/redir?resid=5591523E73255C49!122649&authkey=!AMK9oDBx7lKNGlU&ithint=file%2cbin

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Wing crash after failsafe - what does the log tell me?

June 4, 2016, 5:42 pm
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@stewlg wrote:

I am hoping this crash will prove easy to diagnose. I am not the best at reading log files, and could use some help.

The plane is a 60"+ wing running an AUAV-X2 and ArduPlane 3.5.3. I was flying LOS after a decent launch, and had done a few successful race track passes. Keeping one eye on the plane, I went to take my seat, and tried putting on my goggles. As I was doing so, I had a failsafe. As I was getting the goggles in place I found myself seeming to lose power, in failsafe, and not able to pull up, with no meaningful control. These were very brief impressions, however, so I am very unsure as to what exactly occurred.

There are a number of real and potential problems happening during this flight and I'll enumerate them. But first, a crash video. Doesn't everyone love a good crash video?

Definite problem #1:

I'm running an explictly beta version of the TBS Crossfire firmware, one with a known propensity to failsafe at close distances when running telemetry, which I was. I also could have blocked the antenna with my body at an inopportune moment. So the failsafe itself is explained and does not indicate a loose connection to the flight Controller, for example.

While I believe I understand the failsafe, I do not understand the subsequent crash.

Possible problem #2:

I was testing out an "Auto Launch" mode done through OpenTX config on my Taranis. I'll attach the .eepe file for the interested, but the screenshot shows the important part.

AutoLaunchGladScreenshotOpenTX.png1026x608 53.1 KB

There's a voice announcement, which plays a warning and countdown, then with the plane in FBWA applies 100% up elevator and ramps up the throttle. This allows me to focus on throwing the plane without rushing to get to the sticks before the plane gets stable. Here is where I stole the idea:


www.thedoble.com/uncategorized/lazy-auto-take-off-with-apm/

It does work - the launch is very good if not flawless (I think it needs just a bit more throttle set). But I am still working on better programming for exiting the mode, so it is possible/likely in the heat of the moment switching from LOS to goggles that I hit something and re-set the mode, which could have killed the throttle, or that I just killed throttle entirely myself by pushing the stick down. I have tried to diagnose this possible failure myself in the logs, but so far am just confused by what I find.

Possible problem #3:

I have had a problem in the past where one of the servo connections was loose and it would cause left elevon failure. Immediately before this flight I believed I had tracked this problem to a bad servo extension cable, and had replaced it. Maybe the problem was still present.

Possible problem #4:

When I found my crashed wing, I discovered one of the motor phases was disconnected, and there were some marks and nicks on the wires which lead me to believe the prop may have fouled and caused the disconnection in flight, and not the crash itself. I've now secured the phases more securely, and don't expect this to ever be a problem again, but if this was the issue I would like to be confident about it.

Here's a zip with the various files:

https://github.com/StewLG/catfood/blob/master/06-03-2016%20-%20Glad%20Failsafe%20Crash.zip

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Flight Plan layout swapped? How to get it back?

June 4, 2016, 6:31 pm
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@fireflyer451 wrote:

My Flight Plan screen in 1.3.38 has swapped the Waypoints and Action areas are swapped!?! I have no idea how it got that way, or how to get it back to the standard. Please advise. Thank you

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Help with the History of ArduPilot

June 4, 2016, 8:17 pm
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@swilker100 wrote:

Can anyone help me with the history of the ARDU pilot project. I've used a number of autopilots (Multiwii, NAZA Flip 32, etc) over the years and I think Ardupilot is the best one I've ever used. I'm giving a Key note address this coming week at a UAS conference and want to say a few words about Ardupilot and Mission Planner, can anyone help me. Thanks,

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Takeoff and absolute altitude when mission planning

June 4, 2016, 8:40 pm
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@X1Aero wrote:

I'm planning some missions in absolute mode because I have no idea where my LZ will be. First a question about Takeoff and it's fields. All my waypoints are the actual altitude, so presume the value of 70m in this example means 70m from where ever my home point is. But what's the field on the left for with 20? 20 what lol? Can't imagine this being a delay. The other question about mission planning in absolute altitude. What's happens when your last waypoint is 100m below you and the next command is RTL? Will it ascend before heading home? Thanks!

field.JPG1702x381 88.6 KB

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Cannot change value in Stabilize R/P

June 5, 2016, 12:29 am
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@gfun wrote:

I have APM 2.8 . I tried to lift up the quadrocopter and immediately crashed. After i connected to pc I saw that STB_PIT_P and STB_RLL_P set to 0. then i change to 4.500 and save them(try to set this numbers in Full parameter list and in Extended list) . then disconnected ant connected gain. And again same problem numbers were set to 0. All other settings are in place. only this after every refresh sets to 0

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3DR X8+ successfuly completed an automission, but lost one prop. Need help analysis consequences

June 5, 2016, 2:32 am
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@Vusal_Jalilov wrote:

Hello!

X8+ lost a prop in a 10 min mission. Still it perfectly completed it and did RTL.

I have checked Auto Log Analysis and apart from Battery Failsafe (which I have no problems with) I have noted IMU Mismatch - VIBRATION warning.

X8Lost_a_Prop

Log File D:/.../X8+/Logs/2016-06-05 09-40-19.log
Size (kb) 11438.015625
No of lines 152019
Duration 0:10:43
Vehicletype ArduCopter
Firmware Version V3.2.1
Firmware Hash 36b405fb
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = NA -
Test: Balance/Twist = NA -
Test: Brownout = GOOD -
Test: Compass = GOOD - mag_field interference within limits (14.02%)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: FS_BATT (This is OK and expected)

Test: GPS = GOOD -
Test: IMU Mismatch = WARN - Check vibration or accelerometer calibration. (Mismatch: 1.25, WARN: 0.75, FAIL: 1.50) (This one worries me a lot! Is this just because X8+ flew with only 7 props on?)
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -

Is there anything else, apart of putting the missing prop back, I should do to get the IMU Mismatch back to GOOD?

Regards,
Vusal

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(X12?) Dodeca build; connecting PWM multiple ESC's

June 5, 2016, 3:33 am
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@alpa2009 wrote:

I am buidling a 12-motor coaxial hexacopter and I am thinking on how to connect to Pixhawk. Until now, I just was thinking of using Y-cables to bundle the related ESC's, but this seems not to work with my pixhawk. Searching the web doesn't give me any conclusions if this is possible or not. As pixhawk uses plain PWM output, I don't understand why it should not work. The alternative of using the AUX PWM ports on the Pixhawk seems also not a good option because of lack of failsafe and the fact that you have to manually setup the AUX ports in conjunction with the "normal" PWM outputs...
Any suggestions on this setup and even better, is there somebody who (succesfully) has build a similar setup?

Thanks,

Pascal

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X8+ Tilted, Drifting and Strange Sound while disarmed

June 5, 2016, 3:44 am
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@Vusal_Jalilov wrote:

Hello Everybody!

My X8+ looks to be tilted to back and left while in STD mode and drifts to the back. I touch NONE of the sticks and it drifts for meters. Video 1. Is this normal for STD mode?

I have also noted a strange sound from Pixhawk. Video 2. What does this "dying" sound mean? It is not obvious in the video, but it seems as if the sound "touches" all the props in clockwise direction.

Please, advise and recommend.

Regards,
Vusal

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Acro brutally banks backwards

June 5, 2016, 5:06 am
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@odus_thesar wrote:

Hi everyone,
I 3d printed and build a mini quad with an APM 2.6 controller. I tuned it manually, but still have a big problem in acro mode : i'll throttle up to hover, then push forward to go forward (logic). The quad hovers and tilts, then goes forward for about 10 meters before banking backwards suddenly. It's totally impossible to counter... Did anyone have the same kind of problem before ?
Could this be caused by a too low I gain ?
Thanks for your help !

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