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Would appretiate log analysis help for best cruise speed and stall speed

June 30, 2020, 2:07 pm
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@rsilvers wrote:

My goal is to do long range autonomous missions, so I want to find the best cruise speed. This is an RMRC Recruit with a Matek 765 and an Airspeed sensor. Battery was “2200” 3S LiPo. Motor was 2206-2300 with 5x4.5 3-blade prop. Camera is DJI Air Unit.

I used QGroundControl and did a test where I went a distance in both North/South directions at 15, 20, 25, and 30 mph. The wind was 7-12 mph and mostly South.

I am not sure how to do this, but would love to know the most distance covered per voltage drop for each of the four speed settings. Then I can use that for my future long range flights.

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image2524×1224 312 KB

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Choosing an autopilot for a farm harvest rover

June 30, 2020, 2:19 pm
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@Steve1 wrote:

I am new to this and just getting started. I’m trying to build a rover for our vegetable farm and I need advice selecting an autopilot. There is lots of advice recommending Pixhawk, and I’m ready to buy one so I can start playing with it. but I’m not sure which version is the best fit for my application.

I plan to use RTK GPS so that the rover can eventually travel down the 66" wide vegetable growing beds without running over any plants. Imagine a table on wheels. Lots of space is need for the plants to pass underneath the table.

It will have independent drive and steering, using three motors. I’d like to use two in-wheel hub motors so that there is lots of space for the plants to go without axles, shafts and gearboxes getting in the way. The front wheels would be free-wheeling and would steer via a servo motor moving an Ackerman steering connection.

I want to avoid skid-steering so there is less of a chance of tearing up turf. Is it possible to program differential into the two drive motors, so that based on the position of the servo steering motor, one tire would run at a few percent more RPMs than the other. The harder the turn, the bigger the difference?

I’m looking for an autopilot that will allow me to do all this and will be easy to use for a beginner. Is there any one version of a Pixhawk that is ideally setup for this rover?

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Exterme PID values from Autotune

June 30, 2020, 2:37 pm
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TFMini Plus for simple object avoidance

June 30, 2020, 3:27 pm
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@DoubleD4485 wrote:

Hi.

I want to use my TFMini Plus for simple front facing object avoidance like heading toward a wall or tree and have it stop say at 3 meters.

I did this first and realized it was for terrain following: https://ardupilot.org/copter/docs/common-benewake-tfmini-lidar.html

I have it hooked up to my Hex Cube black carrier board on Telemetry 2 using serial. I looked at the sonarrange in MP and it is showing a number from the lidar which seems correct. I do not want to use it for terrain follow though, so now should I disable those settings as I want to use front facing for object avoidance?

I found this: https://ardupilot.org/copter/docs/common-simple-object-avoidance.html?highlight=simple%20object

I am not sure exactly what I should do now as I have it setup facing down and reading terrain height? I am only going to be using this with Loiter mode to start and I still want to be able to use geofence as well. Do I leave everything the way I have it and set:

avoid_enable=7
prx_type=4
avoid_margin=3 (is that meters?)
avoid_behave=1

Thank you, David

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At the last stage of Roll and Pitch, the altitude is lowered

June 30, 2020, 5:47 pm
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@Ricoman wrote:

It happened yesterday while flying the quad.

There is no problem during hovering.
At the end of roll and pitch, the aircraft drops in altitude.
I raised the throttle, but my quad smashed hard on the ground and climbed again.

The same problem occurred in Stab mode as well as Loiter flight mode.

I hadn’t had this problem before modifying the pid.
This is the first problem that occurred after pid modification.

What caused this?
Can the altitude of the aircraft go down because of the pid?

https://mega.nz/file/CFpHWZTD#dy2YdOjV_XpsuOHBmjhJV9N3TR7UNOkgrAnjyEwZVk0

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X-UAV Talon 2000 mm (with wing extension)

June 30, 2020, 10:06 pm
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@Shubham_Thakur wrote:

Hey there! I hope you guys are at home and safe. These are some difficult times.
Anyways, I just recieced an X-UAV Talon with wing extension and I intend to use it for mapping purpose. I have printed skids, tray, wing joiners etc. I wish to fibre glass the belly for protection. The expected AUW of the bird will be around 4kg.
I was looking for the mose effecient motor and propeller for it so as to increase its endurance. I intend to use 2x 9500 mah Li-ion 6S battery in parallel
70 Amp ESC
Pixhawk 2.1 cube FC
Airspeed sensor
RFD 900+ Telemetry
L9R radio receiver
Sony A6000 camera

I was hoping to achieve 2hrs flight endurance carrying all this weight. Reading on several threads I found peope using cobra 3520 800kv motor with 12 or 13 inch prop. Can you please suggest the most effecient motor and prop combination to achieve max endurance. Will any 3520 800kv motor with 13 inch prop do that for me? Or should I look for another size and brand of motor?

Thank you for your time.
Cheers!
Stay Safe
Shubham Thakur

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Anyone hacked an Amazon Echo Look to get the RealSense data out?

June 30, 2020, 10:33 pm
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@myself248 wrote:

Amazon just dropped support, so these things are $20 all over auction sites right now.

But there’s precious little on the internet about teardowns and reverse-engineering. I know this isn’t exactly a hacking forum, but if there’s anyone with both the skills and interest, I figure they’d be here. :wink:

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Speed sensor and Potentiometer replacement

July 1, 2020, 12:58 am
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@UAVSkies wrote:

I am looking for two solutions and wondering if anyone has past experience addressing this problem in the past.

I have a fairly large size Rover. Its uses a large scale 12V, brushless DC drive system.

  1. What could be the right type of speed sensor I can use with it? I know about hall sensors, but is there a better solution out there that can determine the speed of the rover more accurately so it can be controlled to move at a very constant speed as possible?

The wheels of the rover are simply driven by a drive system.

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  1. The Rover has a built in speed controller. The speed of the Rover is controlled right now using a manual Potentiometer (I don’t know the value of the pot at this point).

As I want the Pixhawk to control the speed of the Rover, is there an off the shelf Potentiometer replacement solution out there that would work with Pixhawk?

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image607×604 111 KB

All suggestions are welcome.

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Drone crash, need help with analysis

July 1, 2020, 1:17 am
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Drone Crash, need help with analyze

July 1, 2020, 1:21 am
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@bigler wrote:

Hello all!,

We need help in figuring out why the drone crashed. We flew a quad, with firmware Copter 3.5.5 in a mission flight ( auto mode). After 10 minutes of flight, at height of 40 meters, the drone switched to alt hold. At this moment, the drone started to spin around itself and descend till it crashed on the ground. We use a sonar rangefinder for landing, and we set:
EK2_ALT_SOURCE = 0, EK2_RNG_USE_HGT = -1, and FS_EKF_ACTION = 2 ( AltHold).
We set rangeinder max_cm = 100 meters. We don’t use optical flow. In previous flights we got bad ekf terrain altitude variance messages. I’m attaching the log file, the parameters, and two graphs. We see a sudden spike in SS parameter (NKF4) before it changed to althold. What is exactly SS?

link for log:
https://1drv.ms/u/s!AiVKA32ezgcGgp8DCClj8Oq0e0xnTA?e=OAiQrw

link for params:

https://1drv.ms/u/s!AiVKA32ezgcGgp8E1fGb2tfLaseXZw?e=mhPE7A

salt_dsalt
salt_dsalt1911×554 27.3 KB
ss_althold (2)
ss_althold (2)1925×560 25.3 KB

Thanks a lot!
Lev

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Gstreamer pipeline in MP HUD?

July 1, 2020, 2:34 am
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PixHawk4 mini - RC in or PPM

July 1, 2020, 4:13 am
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@Mauro_Gatti wrote:

Hi guys, i need a clarification about how to right connect receiver to Pixhawk4 mini. I have an Holybro QAV250 development kit and R-XSR (access protocol) in sbus. I have connected it to RC IN port (via sbus) but sems that QAV not respond in the right way to trasmitter input (roll, yaw, …) . I read in

that RC IN should not be used to connect receiver but only PPM port that should support also SBUS.

I load ardupilot stack 4.03 latest.

Which is the correct reciver installation? Because there are some conflicting info :face_with_raised_eyebrow:!

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Failed autotune, almost crashed

July 1, 2020, 4:30 am
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@Yasiinm wrote:

Hi everyone,

I had an issue yesterday whilst running autotune on roll and pitch. The copter completed the roll axis but failed the pitch axis almost immediately, ending up in major oscialltions after the 2nd twitch and descending rapidly. Luckily the only thing that broke was a carbon fibre tube on the leg.

Could anyone have a look at the logs and let me know if there’s anything obviously wrong? I have noticed an imbalance as left side motors (2 & 5, 3 & 8) are not working as hard as the right side motors. I’m not sure whether that is within allowable limits.

Any other suggestions would be greatly appreciated.

I am running a running a 1400mm X8 frame with a pixhawk cube black. Motors are T-Motor u8 lite 100KV, props are T-Motor 29.2 x 9.5. ESCs are Flame 60A HV, running at 12S.

Log:
https://drive.google.com/file/d/18IDl-ArfR0SjOeAM23VIF5dGx_QQYLvE/view?usp=sharing

Thank you

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Control Speed in AltHold

July 1, 2020, 5:37 am
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@a_ashur wrote:

Does anyone know how to control the speed in AltHold, similar to how you can control the speed in Loiter? Ideally, I would like to govern the drone so that it cannot fly faster than 1 m/s in AltHold.

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How to configure ArduPlane for V-Tail glider?

July 1, 2020, 6:04 am
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@wazoo22 wrote:

This will be my first AP v-tail glider, but I can’t find anywhere in the wiki information on how to set up a v-tail. Yes, the servo functions are there, but the scraps of setup information that I can find scattered around are contradictory. Does this not deserve a section in the wiki? Where to look?
Thanks, all.

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Oscilation when stopping fast

July 1, 2020, 6:34 am
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@Eduardo_Mendes wrote:

Hi,

I have a T-Drones M690 with Cube, that I had to manually tune, as the Autotune does not work at all on it (I tried 3 times, and always ended badly). It is flying ok now, but there is an aggressive oscillation when I stop it fast (releasing the stick). Does someone know how to correct that?

Here is the video and log:


Thanks,

Eduardo Mendes

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Optical flow testing with Gazebo IRIS model and Ardupilot SITL

July 1, 2020, 7:44 am
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@SAMMY wrote:

Hi,

I am trying to simulate Optical flow sensor testing in the Gazebo simulation. To test this scenario, will need IRIS model with the attached Optical flow sensor. After searching I found this https://ardupilot.org/dev/docs/using-sitl-for-ardupilot-testing.html#adding-a-virtual-optical-flow-sensor
I think this method just injects some related random values of the Optical flow sensor to Ardupilot SITL. Correct me if I am wrong.

Is there any way to ArduCopter should get sensor values from the Gazebo environment? Any gazebo plugin that will do so?

Check this link Px4 SITL and gazebo_iris_opt_flow model which simulates the same but model is with Px4 firmware.
https://dev.px4.io/v1.9.0/en/simulation/gazebo.html#quadrotor-with-optical-flow

Thank you

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Loop in Stabilize Mode Causes FC to Lose Orientation and Inverted Flight?

July 1, 2020, 7:51 am
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@Travm1982 wrote:

While flying my Ritewing Z2.5 in stabilize mode I attempted a loop. The autopilot took over at 90 degrees pitch up and completely overrode my inputs. The plane performed a radical maneuver to rite itself, then proceeded to enter a hard left turn to a steep nose down pitch. I switched to RTL and the plane ended up hitting the ground at full throttle while inverted at a shallow angle. I had plenty of altitude for the plane to recover after switching to RTL. Is it possible the flight controller lost orientation and began flying inverted. The plane contacted ground at a shallow angle like it was trying to climb out while inverted. My flight controller is a matek f405.

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Lidar Lite v3 HP not detected on Pixhawk 4

July 1, 2020, 3:48 pm
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@apache405 wrote:

I am some trouble getting Copter 4.0.3 to recognize the lidar lite v3 HP that is installed on the copter I am working on.

I get the following message in mission planner: PreArm: Rangefinder 1 was not detected

Here are the parameters I have the Lidar set up with.

image
image2880×1800 525 KB

There is also an IR LOCK on the same I2C bus that appears to be recognized.

When I put my phone’s camera under the Lidar lite, I don’t see a blast of IR light from an LED or laser, so I am not sure if the unit is getting power or not (I will check this with a voltmeter shortly)

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Tracker lags in position in both pitching and yawing

July 1, 2020, 8:51 pm
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@wcfung1 wrote:

I got the tracker (AT v1.1.0) working to track (not exactly) the quad.

But during tracking, the tracker does not point exactly to the quad, either in altitude (pitching)
or in left and right position (yawing offset ). But it follows the quad only in the direction of movement.

Attached is the parameter for trouble shooting. Could it be the P, I, D settings of pitch and yaw ?

Thank you for your help.
Param__works__but pitch n yaw lag behind.param (8.5 KB)

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