this is not unusual at all. The magnetic field is a 3D vector. Let’s assume you are in the northern hemisphere. You will have a strong positive Z component to the field. If the current from the power system adds a negative Z component (due to wires below the compass), then the length of the total field will drop.
Try plotting the individual components, not the total field length.
Cheers, Tridge
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Throttle up but magfield down
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Pixhawk rebooted in mid air
you forgot to share the log with those with the link, but while admitting to being experienced at ignoring warnings about voltage & compass … is a crash now and then really undesired by you ? 
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How to modify firmware for motors power loss
@khancyr https://github.com/AzurDrones/ardupilot/tree/motor_failure_switch should be in master, that would help users test and learn what a given RPAS , with a given payload , will do…
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Building a Better Quad Frame
Plywood Box Torsion Tests - Solid vs Cutouts
I’ve confirmed @Ragbagger’s design by testing my 2mm (1/16") birch plywood box, both with and without any cutouts. On my torsion test stand there was no perceptible difference in stiffness between the solid box and the same box with cutouts, even though the cutouts resulted in 20% less weight.
The next step will be to make some longer boxes and test those as well. The frame design I’m working on will use a box that is 310mm in length. I will be testing a 25mm height (same as the box in the video) but I also want to compare 20mm and 30mm heights at the full 310mm length.
My next frame design will be flexible and efficient enough so if you don’t have a Dremel, router, or an easy way to do the cutouts, you will still have a very efficient frame with longer flight times that most commercially available drones.
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Issue with camera trigger during non grid mission
Hi guys. I am having issues getting the camera to trigger when conducting a waypoint flight using the DO_SET_CAM_TRIGG_DIST command. It works fine for a grid survey or when selecting trigger camera now, it just doesn’t seem to be working during a waypoint mission. The bin file states that no triggering occurred. Can anybody assist as to why this may be please? Am I missing a step as I notice that when in Auto Grid planning that the camera settings are available, but this does not appear to be the case when simply adding the DSCTD command within a mission. The other thing I cant figure out as how to tell if the camera is triggering during flight please. I am using a Sony A6000 in a Tuffwing mapper with Tuffwing camera cable and hot shoe. Any help greatly appreciated.
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Question: Boat decreases throttle during turns
Hello! Quick question for anyone here: On the newest firmware, my boats are decreasing throttle during turns. Previously, I would adjust the “SPEED_TURN_GAIN” to 100 to maintain throttle throughout the turn, however, this parameter appears to no longer be part of the code.
Does anyone know how the throttle is controlled during turns or if there is a replacement parameter? I am not using vectored thrust and would like to maintain throttle during turns.
Any input is appreciated!
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Issue with camera trigger during non grid mission
Was unable to paste an image of the flight plan. Just to confirm, DSCTD inputted with a distance value of 30 set.
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Albatross Tuning Help
I ended up using the PX4 setup for my initial flights since it was pretty turnkey but not what I wanted. I just adjusted the min speed depending on my takeoff weights and fiddled with the min and max flare amount but I’m still planning for Arudplane once past more initial testing. Autolanding is pretty neat to watch, albeit scary the first few times I did it.
I would say that the one thing to take into account would be how long it glides for, doesnt seem to stop but I have the airbrake setup enabled which does bleed speed quickly. Reverse thrust will be awesome with this. Also, get your min speeds correct given the high aspect ratio of the wing (I was warned about this in the beginning several times to avoid tip stalling). There’s quite a lot of deflection surface on the wings but I don’t know more than that in terms of what it would mean for tuning. I would think it needs quite a bit of time spent on TECS given how much power it has but I don’t know yet. I really want to get this over to Arduplane since thats what im used to but the path of least resistance was unfortunately going with what was already tested and available. I don’t know though about just trying the standard tuning. It would seem this thing can be as mild or wild as you’d want so thats scary from my view trying a new setup first.
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Hexacopter wants to lean over before liftoff
The log files shows it is not flying well.
Here is desired against actual
Definitely needs an autotune.
But I can’t quite pick where this is coming from, either the RCin noise
or some frame flexing.
Your RCin does not reflect your RCout as you can see above your throttle is only at 1300 but the the motors are at 1600 to 1700. Some calibration required here as well.
Also notice the separation between the motor outputs.
Some issue there as well I think. Your CCW motors are working quite a bit harder than your CW motors.
But this graph of the Actual/desired yaw against RC4in indicates either a very bad tune or some major flex.
The controller is fighting real yaw oscillations.
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Wingsail Setup with Pixhawk4 and RPi
Wow…super impressed to see the progress on the sailing code front!
I’ve been wanting to try a wingsail setup. I’ve tested it manually enough to realize I really want to aim that sail better, and I decided to try a stepper motor to turn the mast.
I built this setup with a RPi and L298n to run the stepper motor.
[https://drive.google.com/open?id=1BQSqxTmyIm-Hpx_rznNIGuKh1fatMpMq](http://RPi setup)
After reading through the other threads, I ordered that awesome looking windspeed sensor and the 360 pot.
I’ll get the code loaded up and start messing around, but it’s nice to know that I just need the RPi for the stepper motor and additional sensors.
I’ll have to start thinking through the sail aiming based on wind direction. I’ve read where others have created a fairly simple lookup table?
Cool to see others interested!
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Trad Heli Attitude controller requirements - Help Requested
@ChrisOlson thanks for the great information. I think until we have time to think about this more, we should try put a bandaid on this like has been done until now. I would like to get spool logic squared away and see what it will look like in its final form.
So I think I have a solution to this. For non manual throttle modes, a flag can be set to inform the motors class of this. Then the motors class will know if it sees the motor interlock disabled and the collective is above collective lower limit then it will perform a collective schedule that will be slow initially to allow the aircraft to descent without losing too much rotor speed but then ramp down quickly to collective lower limit or some specified autorotation collective value. I think this would be a little better than the current implementation of just a slow descent rate until it stalls the rotor.
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Nimbus Tricopter VTOL
@GregCovey i have adjust trim and endpoints setting in the servos tab on mandatory config. We had issue with tail servos centering. Awaiting our savox to arrive. Havent flown the system again. Ive advise foxtech about there servos burning even laid down on the table. They supplied us with analog emax.
We have intergrated the airspeed sensor wiring with the pdb on the nose.
Cheers.
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Pixhawk rebooted in mid air
Sorry my mistake. Its open for sharing now. Thanks man
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PreArm: check steering and throttle config error
At the moment I am using RC direct (SERVOX_FUNCTION = 1) with discrete results, all other functions except Ground steering don’t produce any output, I checked with a LED and an oscilloscope.
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Copter-3.6.0-rc12 available for beta testing
The NaN in CTUN>DSAlt is a known issue with the log analyser. It’s on the to-do list to fix but doesn’t affect flight (it only runs on the ground station).
It might be good to go back to 3.5.7 to help separate what issues are specific to 3.6.0 and which are not. I suspect that most of these issues are actually setup issues. separating them helps keep the 3.6.0 testing from getting weighed down with regular setup support calls.
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Seagull #Rec and camera trigger
vosair,
Any chance you could go back to 3.5.7 and see if you can get it working there? If not then it’s likely a setup issue. If you can get it working on 3.5.7 but not 3.6.0 then it’s likely we’ve got a real issue in 3.6. Sorry to pass the buck but I’d like to try and separate out the regular vehicle setup issues from the 3.6 issues. If we don’t the 3.6 beta testing period becomes incredibly long because we end up chasing regular support issues.
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Escs continue beeping
Andy chance you could try on 3.5.7 to see if the same problem exists?
I guess you’ve done an ESC calibration of course?
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Nimbus Tricopter VTOL
Michael, yes is spanish, he said that in this video he explain how to setup the ardu, that is the same that he write in his blog http://www.sop-fpv.com/tecnologia/item/28-mini-skyhunter-vtol-y3-parte-i. http://www.sop-fpv.com/tecnologia/item/29-mini-skyhunter-vtol-y3-parte-ii. The video is part two, perhaps Is easier to understand if you download the document and ask to google to translate the doc, any misunderstand ask here.
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Mods for night flight?
The stock LEDs waste most of their light by pointing inside the mostly black cavity.
A modification which which adds no weight but increases night visibility greatly is to carefully drill a hole in the plastic lens the same size (3mm if I remember correctly) as the LED and assemble with the LED partially through the hole with the lens pointed down. Position the hole as close as you can to the center of the drone so the leads will be long enough to allow the LED to reach after they are bent at a 90 degree angle. This can be done without disassembling more than the lens.
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How Do You Transport & Store Your SkyViper & Tx?
OK. Here is a nice cheap solution if you want to baby your SkyViper.
This is a covered shoe box which just happened to fit width and length perfectly. I cut at the corners, folded and glued down down the sides of the box to make the height required.
The formed plastic cradle which held the SkyViper in the original shipping box is taped to center of the bottom of the box and the foam pad glued to the cover holds the drone in place when the cover is closed. This avoids putting stress on the arms which might deform the plastic over time.
The extra cardboard barriers are held in place with flaps folded and taped to the bottom of the box. These barriers create storage areas for the batteries and accessories.
I have used this box in a carry-on when I want to bring some cheap fun along on a trip.
The controller is less fragile, especially if the thumb levers are removed. It gets tossed in the bag alongside the box.
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