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Users => Applications - Autonomous Flight => Topic started by: TMGsi on June 09, 2016, 04:20:34 pm

Title: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 04:20:34 pm
I can not fly in the PositionHold or CourseLock mode, the revo no weapon. Even foxed with 10 satellites.

Stabilized1 in the mode the flights is very stable. Perfect.

I the battery runs dows the revo may interfere with the magnetometer?

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 05:17:05 pm
see photos of how it is mounted.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 09, 2016, 05:20:11 pm
If there is a GPS flight mode configured into the flight mode switch, Revo will not arm unless:
- Configuration -> Attitude -> Settings -> "Attitude Estimation Algorithm" is set to "GPS Navigation (INS13)"
- HomeLocation is set
- Mag (magnetometer) is calibrated
- Mag is green color in system health
- GPS is green color in system health

Besides that, all the high current motor wire pairs (and triples) must be twisted together with the pair becoming one cable.  If not, you may get a "fly away".

I recommend that you play with "Velocity Roam" flight mode because it is simple, safe, and more interesting than "Position Hold".  If you leave sticks in the middle it is the same as Position Hold.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 09, 2016, 05:22:28 pm
The fact that you have it flying well in Stabilized1 (which is Attitude mode) is a good sign that you are almost there.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 09, 2016, 05:27:05 pm
I changed the title of this to say "not arming" because the other was minor bad and could make readers afraid.  :)
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 05:37:11 pm
Ok, thanks for the help.

The "Navigation GPS(INS13)" is enabled.

Now I need to confirm that "Homelocation is active" How do I know this?

and

Magnetometers are calibrated, but sometimes is not in green.
The Gps yes, is green.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 05:40:47 pm
in flight stabilized1 enough, I made up a video and posted on Youtube.

Flying in FPV and distance myself around some 700 meters.

:)
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 09, 2016, 05:52:27 pm
OK, so it is probably Home Location.  To be honest I forget the standard user ways...  I suggest that you right click GCS GPS map (Flight Data) (tab) where you want to set it (zoom in and find yourself first), and select "set the home location" from the "right click list".  It will ask for altitude.  Enter altitude.

but I must stress that it is important to have motor power wire pairs twisted well.  Else mag goes crazy only when motors are running hard.  Crazy mag means it doesn't know where it is pointed.  Doesn't know where it is pointed means the harder it tries to get to where it should be the farther away it goes.  Fly away...  Because of this, please switch from Stabilized1 to VelocityRoam and be very ready to immediately switch back.  Football field size place at least for first try.

It is normal for mag to be green only sometimes when on the ground.  In the air it should be green almost all of the time.  It will let you arm when it is green.  Then it will stay armed even when not green.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 06:31:56 pm
I do not see my street, my house.

Even increasing or decreasing the zoom.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 09, 2016, 06:43:23 pm
my altitude I find this screen, oK?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 10, 2016, 02:00:23 am
You must zoom in a lot more than that, so that slider is almost all the way to (+) to see houses.

Yes.  That screen works for altitude.  For all the GPS data you can expand DataObjects->GPSPositionSensor.  I think that the exact value for that value it wants when you set home location would be altitude + geoidseparation taken from GPSPositionSensor.  For me the numbers are altitude=300 and separation=-30 so the sum is 270.  Truly the exact value does not matter until you start doing absolute position waypoint flight.  It does not matter because everything is relative to starting altitude.  When you enter (examples) PositionHold or VelocityRoam mode, it gets the current altitude.  It does not matter if it thinks it is 100m or 1000m.  If the aircraft finds itself at 101 or 1001 it knows it must come down 1m and acts the same whether starting with a number 101 or 1001.  Only when you have absolute position waypoints and must fly close to ground without crashing does it matter.  And then you find out how badly inaccurate GPS altitude is.  You had better leave 5m above the ground or you will run into the ground sometimes.  Baro sensor helps for this in some cases.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 12:35:39 pm
I made an organization on the wires. The esc wires grouped into one, just left a wire with positive and negative, the other 3 just let the signal wire.

I pulled the fpv transmitter of revo.

Now I'll take the test and see how it was.

I will try to fly with the first VelocityRoam. Just flew in stabilized.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 01:09:46 pm
I mentioned that I did not locate me in the flight data my street and my house.

I realized that the latitude and longitude shown the flight data is different from that shown in the system.

see the photos

The flight data do not see nor my city. Even with all the zoom.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 01:39:19 pm
I found my city and my home. I typed my city "go to place:"

But it was a red line that I think goes through my contry.

This red line is normal?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 04:39:39 pm
After I located my city in Flightdata, it was easu to find my home. The red line lo longer appears indicantig another latitude and longitude away from where I am. (less a problem)

Now

When I put in (INS3) the mag is always red. Even after calibrating.

My GPS is OP_GPS. It has right side to put in the quad? minimum distance? The cable it is very short.
The OP_GPS good?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 10, 2016, 05:38:21 pm
When both GPS and Mag are green, you will see Atti and Stab become green.  That is the signal that it is ready to arm.  GPS leaves a red line trail (including maybe some long jumps) but only when it is armed or ready to arm.  You don't see the trail because Atti/Stab are not green and they are not green because GPS and mag are not green...

When GPS is green or working, you can right click on map and say UAV -> go to UAV and map will center on current GPS location.  Then just zoom in.  That is the best way to see where you are.  I suggest you play with right click on GPS map.  There are a lot of things there.  One thing you might like is enable diagnostics (I forget exact name).  It makes a green trail even if red trail is not available.

Does GPS go green?  If so it is connected correctly.  OP GPSv9 is good.  New (unreleased) firmware fixes a tiny issue that was not even found until recently.  Even better, GPSv9 has a mag.  If you put it up on a pole, it gets the mag far away from motor wires.  You must calibrate mags with GPSv9 connected and powered (flight battery) and then you must go System -> Settings -> AuxMagSettings and change Usage to OnBoardOnly to avoid the mag on the main board.  It is very much best to calibrate mags using RF telemetry and outdoors away from big metal and off the ground.  One bad thing is that it is always gathering data during the whole calibration, not just during "press and wait".  So you must NOT set it down or on metal etc at any time during mag calibration.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 10, 2016, 05:40:12 pm
GPS does not work very well indoors.  You may not be able to get green GPS indoors.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 05:58:07 pm
How do I Know which version of my GPS?

I bought in Banggood.
http://www.banggood.com/OP-GPS-for-Openpilot-CC3D-Revolution-EVO-Atom-Mini-CC3D-Filght-Controller-p-1000066.html
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on June 10, 2016, 06:47:48 pm
That's not the OP GPS that Cliff was referring to, it has no external mag.  It's just a tiny, minimal gps that the Chinese call OP_GPS because they put the proper connector on it to plug it into a cc3d or revo.  The one Cliff was talking about isn't made anymore.

If you want to run GPS modes you'll need a GPS with a mag in it and it will have to be mounted on a pole.  Something like this one mounted above the quad on a pole.  http://www.banggood.com/Ublox-M8N-GPS-Compatible-with-DJI-NAZA-Lite-V1-V2-Flight-Controller-Phantom-1-2-Vision-p-991718.html?cur_warehouse=CN

Everything else Cliff was saying applies to this GPS too.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 10:22:47 pm
Hello Hwh

This Gps you spent the link is compatible with Revo?

My Gps (Op GPS mini) will not be able to fly in GPS mode (VelocityRoam) ?
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on June 10, 2016, 10:40:41 pm
Yes it is.

The one you have works as a gps but doesn't have a mag chip in it.  In most quads the mag chip on the revo board is too close to the magnetic field created by the power wires and motors to work properly.  All the gps modes require not only a working gps but a good, green mag.   On all but the really big quads that means an external mag on a mast to get it above the interference created by the power wires and motors.

You can either get a gps with a mag in it like the link I posted or add just an external mag on a mast.  https://forum.librepilot.org/index.php?topic=1610.0 shows a picture of one of the mag only boards that someone mounted inside a larger gps than the one you have.  The downside of the mag only board is that it takes another port on the flight controller so the gps and mag use both ports.  The gps I posted a link to uses only one port for both the gps and the mag together.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 10, 2016, 10:57:27 pm
Ok, thank you for the information.

Again thank you Hwh

and

thank you TheOtherCliff


Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on June 11, 2016, 01:53:43 am
The current release (15.09) does not yet support these "aux I2C mags" that are built into the inexpensive PixHawk GPS units sold for instance on eBay.  The next release (really soon now :) ) has support for them, or if you can build your own code, just build and fly 'next' (standard cautions about it being pre-release and less tested than a release).

This imminent release also has support for DJI/Naza GPS/mag which is nice like OP GPSv9 because it has GPS and mag, and only needs one port to support both.  Sometimes you can find them new on eBay for $80 or so.  FPV people often need the extra port and want to have both GPS and mag on the same port.  There are some really bad (dropped packets) clone DJI/Naza GPS for sale on eBay for about $25 or so last I looked.  They work, but mine locks up (just stops sending data for no reason) maybe once every 24 hours of operation.  I have flown it about 5 times with no problem.  As long as you are not doing waypoint flight, you can just take control back if it locks up.  There are several versions and the later versions may have the worst problems fixed.

I personally have all these kinds of GPS/mag units and fly them all with the soon to be released code.  :)

Also, this coming release has support for TauLabs Sparky2 flight controller.  It does not do PWM, but is nice in that it has an extra I2C only port that works with _some_ external mag units.  It also does S.Bus on the standard receiver connection and so it leaves MainPort free if you need S.Bus RC protocol.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 18, 2016, 01:50:43 pm
Hello Hwh

The Gps you post link banggood (in reply #20), I'll have to cut the conector and replace the connector revo? Would it be this? It's simple?

Thank you.
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on June 18, 2016, 05:24:18 pm
Yes you would.

Because the connectors are so tiny and hard to attach most people (even most developers) order short 100mm cables with the connectors already attached and splice them on.  http://www.ebay.com/itm/20-SETS-Mini-Micro-SH-1-0-4-Pin-JST-Connector-with-Wires-Cables-100MM-/251979895512?hash=item3aab2c12d8:g:U3AAAOSwpdpVbHGL is one of the eBay auctions for the proper one.  They're JST brand type SH connectors with 4 pins.   I think I've ordered them on AliExpress too.  Most of the cc3d and revo FC come with one or two cables that can be used.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on June 18, 2016, 06:13:11 pm
Yes. I have a 4 stored cables. They are cc3d and Revolution.

So, with this GPS I can fly VelocityRoam? it wil work?

other question,
This GPS has a magnetometer and a single cable to connect the revo. Ok?
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on June 18, 2016, 07:09:39 pm
All the Naza clone ones only use one cable for both the GPS and Mag.  Mounted on a pole it should make the GPS modes usable.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 19, 2016, 10:57:54 pm
Hello Hwh.

Came my GPS (ublos M8N for Naza)
Now I am in doubt as I can solder the wires and make the connection to the CC3D.  And also I have kept the wire that connects the CC3d,
How is the order wires to solder them?

Thank you.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 19, 2016, 11:15:27 pm
You can follow the connection diagram provided while doing Wizard steps.

(https://forum.librepilot.org/index.php?action=dlattach;topic=1793.0;attach=3680)

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 19, 2016, 11:20:33 pm
Thank you very much.
I will try here.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 01:24:33 am
I made the GPS connection for the revolution.

If follow the given diagram, no light flashing in GPS and also no light in the revolution.

to try to reverse the wire diagram, gps flahing red led and the revolution will also flash their leds.
But flightdata (GCS) GPS is disabled even it flashing its red led with the battery connected on the controller.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 05:00:14 pm
The OP_GPS (without compass) works on my Revo, but the Ublox M8N GPS (with Compass) will not work.

Help me.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 20, 2016, 05:18:31 pm
Are you talking about the Naza clone that do not work ?

You just need to follow the wiring i posted previously, go to the wizard and select the Naza in GPS page.
The Naza GPS do not use the same protocol so the config is different.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 05:49:44 pm
Where is the place to select Naza?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 07:20:38 pm
How to change the GPS protocol for Naza?
I do not know how to configure.

I've done the connection to Revo as shown in the diagram.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 20, 2016, 07:35:44 pm
Run the wizard, there is a GPS page where you can choose Naza GPS

(https://forum.librepilot.org/index.php?action=dlattach;topic=1793.0;attach=3684)

Or change the GPS protocol from UBX to DJI in Hardware page
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 07:49:37 pm
Not appear the option of selecting the GPS Naza the wizard.

see photo attached.

Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 20, 2016, 08:03:14 pm
Assuming you run the GCS version from Next branch...

You can download here: https://forum.librepilot.org/index.php?topic=1910.msg13686#msg13686


15.09 supports only the GPS v9 with integrated Mag from OP
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 09:21:17 pm
I downloaded and installed, loading the GCS does not work. windows error.

my windows is a win10 64
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 20, 2016, 09:46:05 pm
GCS installed on another laptop (with WinXP 32bits) and it worked.
:)

And I could make a revolution to recognize the GPS M8N. Now GPS flashes red and blue Led.

I will install a post on my drone and attach the GPS and end wint the setting.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 21, 2016, 12:11:50 am
Now that GPS M8N was installed in the drone and the revolution recognizes it.

It is time to complete the setup.
How to let the GPS compass function instead of the compass of the revolution?

Setting for me to fly velocityroam?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 21, 2016, 12:19:52 am
Calibrate Mag and set orientation:
https://www.youtube.com/watch?v=o4V_ZGG0Hk0


First try a basic Positionhold.

Title: Re: Revo not arming in mode that depends on GPS
Post by: HighAltitude on July 21, 2016, 06:01:50 pm
I'm having a similar situation with my quad.
After lots of experimentation, I was finally able to enable 3 flight modes (Spektrum DX9).  I configured the "Gear" switch (Channel 5 on the transmitter) as my arming switch designated as Accessory 0, but every time I change anything from the default values, the vehicle won't arm.  I'm not sure what sequence/combination of configuration changes I made to my transmitter and Librepilot, but the RC Input now shows input for 3 flight modes using the transmitter switch D as Accessory 1. 
I still can't change anything else without disabling my arming switch. 
It's flying just fine with all the default settings. 
This AM, I twisted all the motor wires, set the home location, calibrated the magnetometers, connected to 9 satellites, and the GPS and magnetometer alarms show green. 
I've tried setting both Stabliized 1 and Stabilized 2 to Velocity Roam, but the arming switch still doesn't arm unless I return all the settings to the defaults. 
I must still have some incompatible settings somewhere, but can't figure out where.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 21, 2016, 06:32:10 pm
I think you simply cannot arm while flightmode with VelocityRoam is currently activated.
If armed you cannot do any changes to configuration.

Post your config file if you don't resolve the issue.
File > Export UAV settings

GCS version ?

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 05:36:30 pm
Hello
First test flight with GPS M8N
Objetive: Takeoff and Flight mode PositionHold
Result: No holds position

Details: with the GPS INS13 selected and PositionHold the key my radio.
The quad takes off with tendency to the left and back. When pressing the key to flight mode to PositionHold the quad does not hold the position and continues its tendency to go left and back.

Test without GPS Ins13 enabled.
The quad has no trend at all. Completely stable.

How to solve it?

Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 22, 2016, 05:50:23 pm
First: Before trying autotakeoff or any automatic stuff you should try PosHold alone.YOU are the pilot, at least while begin testing.

Be sure you select the right flightmode, double check moving your switch and look at PFD or RcInput.

Also take in account the GPS position can drift while flying to close from a house/wall, using almost half sat constellation.
Be sure Mag still Green while motors are running.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 06:08:45 pm
I did not do the automatic takeoff. ( I am the piloto) :)

I lifted fhight ( about 3 meters) and selected the PositionHold key on my radio.

I have no way of knowing if the mag is green while the motors are running. I have only the USB cable of i meter to connect to the computer.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 06:28:05 pm
Why when are with the basic algorithm the quad does not have any tendency, full stable.

When I flew with GPS InS13 algorithm presented tendency ???
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 22, 2016, 06:48:38 pm
Complementary (basic) use only Accelerometers/Gyros to find how is the board attitude.

INS13 uses 13 inputs to find the attitude and position.
https://librepilot.atlassian.net/wiki/display/LPDOC/INS13+-+GPS+Navigation?src=contextnavpagetreemode
If your mag is wrong, attitude is not perfect.

But if all is calibrated correctly and not disturbed, all works fine.

AutoTakeOff, posHold, AutoLand:
https://www.youtube.com/watch?v=39UFGajb7rg
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 09:04:11 pm
I learned more one, the INS13, 13 is 13 information entries. All working 1khz, wow.

The video is also formidable.

My problem:
In the video posted earlier, to configure. At the time of leaving the 3 axis ( X axis, Y axis and z axis) I can not leave zero.
The problem here can be. Help me
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 22, 2016, 09:13:33 pm
If you don't have set correctly the auxMag orientation you should not fly...

Set orientation:
First set the Z value: 0 or 180 > look at bar with Z label, move board. Value stay to 0 ?

Second step : change the Yaw value, -90, 0, 90, 180 and check the X and Y bars and try until the value stay around 0.

This assume the onboard mag and auxmag alarms are green and your GPS/Auxmag not oriented randomly at 30° or something.

https://www.youtube.com/watch?v=qLsd4O75N9o 
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 10:22:41 pm
I could leave PositionHold.

I'll be honest, I was almost giving up.

But I got it.   Wow....wwwww

Thank you F5soh

Need to become more fixed, it is time that varies but is time that is fixed.

Already is a beginning.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 22, 2016, 11:35:00 pm
In the configuration of video you have just posted the controller and the compass.

In my case, the controller is already installed in the frame, motor, esc, all installed.
To set the compass in this mode is more complicated to make the perfect settings?

to be perfect is to be only the controller and the compass?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 22, 2016, 11:59:04 pm
No issue.
All calibrations should be done if flight conditions, all installed on frame... especially for Mags.
Except maybe accelerometer calibration that can be done more easily using a box on a desk.

For video, manipulate a board is more easy than a complete frame.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 23, 2016, 12:16:24 am
I did not understand how to calibrate the accelerometer using a box on the desk.

pass this tip, more detailing.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 23, 2016, 12:28:54 am
Quote
This calibration should be done while the controller is unmounted on frame, a controller case is preferred and allow accurate/stable positions.
The controller can be adjoined against a box for best position.

https://librepilot.atlassian.net/wiki/display/LPDOC/Sensor+calibration#Sensorcalibration-Accelerometercalibration

Board in a case and a small box that help to maintain the case/board at all steps
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 23, 2016, 09:48:48 pm
I made a flight VelocityRoam. But I have to leave the quad more estable. In PositionHold so the quad can not get more than 10 seconds, it starts to encircle the point and leave may even fall.

The quad I'm testing the flight mode GPS is a 250mm. This type of quad is with good settings? or just quad greater than is good?

I can not better leave the settings.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 23, 2016, 10:47:12 pm
If the quad start to do "toilet boiling" after a few second the issue is Mag.

Did you set the Mag source to AuxMag only ?
Where you mount the AuxMag ?

If Mag is not disturbed and away from power wires, there is no issue with frame size.


Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 23, 2016, 11:37:20 pm
Yes, only the GPS auxiliary.

see the photos in  which the GPS is located.


I had to make the GPS support, not support came when he got , and a two months delay to get the support, so I did this.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 23, 2016, 11:43:43 pm
Mag should not be disturbed here...

Be sure the orientation is ok, double check if compass heading in PFD match the North for example.
You can switch fusion algorithm from INS13 to INS13Indoor so you don't need GPS and can still indoor.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 24, 2016, 08:54:24 pm
The compass is ok, the PFD and my compass table are correct.

I made a video as is the quad in PositionHold mode. I can not post it here in the forum, I made my phone. As is the way to post video?

I changed the algorithm for INS13indoor and quad not started the engines, when you have the PositionHold or VelocityRoam as a choice option in the key of my radio. Even the MAG being green in the PFD.

What flight mode works with INS13indoor?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 24, 2016, 10:09:15 pm
INS13 is just used to test EKF and Mag, indoor without GPS
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 25, 2016, 01:22:05 am
https://www.youtube.com/watch?v=kHat8xk0IRM

to post video is only youtube?
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on July 25, 2016, 01:38:23 am
...to post video is only youtube?
No, you can host the video on any site you want. Vimeo.com is another common one.  There are probably others.

Youtube works well because the forum software makes a preview for it automatically but you can host the video anywhere you want.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 25, 2016, 01:53:05 am
Thank you Hwh.

I was trying to post direct video the forum, how do I post pictures, and was not able to.
Now I understand how it is.

Then I will post the video of my quad in PositionHolg and post also how it is setup. I need help.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 25, 2016, 10:27:16 pm
Look at my quad situation PositionHold

https://www.youtube.com/watch?v=fuE1Uzz861w
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 25, 2016, 11:37:58 pm
Something wrong with Mag for sure; the quad do circles or "toilet bowling" so he try to compensate position error in a wrong direction.

Did you set to "AuxMag only" ?
Looking at mast i think you also need some pitch value to match perfectly the Auxmag orientation.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 26, 2016, 11:43:11 pm
Yes, AuxMag only!

Today I recalibration compass (outdoor)
By making the flight test PositionHold still circulating in point.

When checking in GCS has the mag moment that turns red when turning the quad yaw.

The mag is only green in one direction, while turning it turns orange or red.

so
I ask:
My M8N GPS is good? (compass)
Would anyone has left the fixed quad in PositionHold with the GPS?

I'm distrusting of this GPS. ( a compass only)
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 27, 2016, 12:09:20 am
Mag should be always Green, at least the AuxMag.

Please post your config file: File > Export UAV settings...
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 27, 2016, 12:49:50 am
Ok.
attached
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 27, 2016, 01:01:39 am
I'm pretty sure your Auxmag orientation is wrong, you set Roll: -5, Pitch: -9 and Yaw: 35°

According to how you mounted your GPS you should have:
Roll: , Pitch: -5° (value to be defined because your mount is not level) and Yaw:

Your onboard mag is used as reference but seems disturbed... maybe a lost buzzer around ?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 27, 2016, 01:11:57 am
These values in roll,pitch and yaw, With theses values the flightdata shows all level.

I did not understand the buzzer.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 27, 2016, 01:18:10 am
Maybe level but if currently the quad try to compensate with a wrong heading, the result is what you get.

Do you have a lost buzzer close to the board ?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 27, 2016, 01:33:26 am
I have this, see photo
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 27, 2016, 01:40:09 am
This one has also a permanent magnet inside so the onboard mag cannot be used/thrusted as reference for AuxMag orientation.

Set the AuxMag orientation to Roll: 0°, Pitch: -5° and Yaw: 0° and try a posHold.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 27, 2016, 09:55:58 pm
I could leave positionHold
without circulating (the problem was solved)

By mentioning the buzzer, I redid all the calibration without the buzzer

and

let the onboard mag. (onboard was bellter that auxmag)

I'm not to believe  :)    :)    :)

Test after the return to home.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 27, 2016, 10:51:10 pm
I have a question in return to base.

I'll do the first test. The HomeLocation is set (my house)
the test place is in another neighborhood.

I need to set the new location of Homelocation? ( the place where I will take the test will not have internet)

OR do not need,
the revolution knows the place where took off?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on July 27, 2016, 11:22:39 pm
Take a look here:
https://librepilot.atlassian.net/wiki/display/LPDOC/Return+to+base#Returntobase-TakeOffLocationmode
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on July 29, 2016, 12:16:18 am
I was very happy to be able to leave the quad in PositionHold.

I test the ReturnToBase.

RTB programed for:
                            up 25 meters;
                            back from where took off;
                            and land.

in the first test it was ok.
In the second test the engines turned off in the  25 meters and there was the fall.

This fall upset me.

Why engines stopped?

In the fall the quad crumbled, I went home and I mounted again. Thank God all the pieces worked.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on August 04, 2016, 08:00:44 am
I see the "lipo alarm" in your "lost model alarm picture" and it does not have a magnet in it.  Should not cause problems.
Wrong, it does, and can have a small effect even 20cm away.

Problem was definitely the mag compass.  Flying circles (toilet bowl) during Position Hold is always mag compass issue.

Even when mounting aux mag (and GPS) on a post, you still must twist all "high current" (thick) motor wires, ESC wires, and battery wires.

Sometimes I have seen that mag reading is not very good when quad is sitting on the ground.  I also sometimes have a hard time getting green mag at beginning.

Figure out what caused "fall out of sky" during RTB...   What happens when you are flying and you switch off the transmitter?  Does it fall then?  1 - Maybe it was a radio issue?  2 - I think (not sure) there is code that watches RTB course and if it is not flying in correct direction, it may give up and turn off motors so it does not fly away.  This #2 would be related to mags again.

Also: I suggest that you use VelocityRoam mode instead of PositionHold mode.  If transmitter sticks are in the middle then VR is same as PH and it stays in one place.  If you move the sticks, the quad moves.  Release sticks and quad stops.  More fun and more useful.

Lately I have not been in forum much.
Title: Re: Revo not arming in mode that depends on GPS
Post by: Mateusz on August 04, 2016, 08:59:18 am
1) Mag issue

What GPS mast are you using ? I've been looking at your photos, and it seems like something custom or self-made.
Be sure that the mast is NOT rotating. Rotating mast invalidates mag calibration.
Also be sure that compass (or in your case GPS) is mounted flat on the top of the mast. External magnetometer must be aligned perfectly with flight controller.
Finally, make sure that you always have green external mag, even when motors are spinning. To see that you can use OPlink modem (no need for USB cable).

2) Motors shutting off
Motors should never shut down in flight unless fail-safe is triggered, or something got disconnected in flight.
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on August 04, 2016, 09:54:05 am
I see the "lipo alarm" in your "lost model alarm picture" and it does not have a magnet in it.  Should not cause problems.

Most devices that have a buzzer have a permanent magnet inside.
See what happens when this one
(http://i.ebayimg.com/images/g/3ocAAOSwQItUCAVG/s-l300.jpg)

move around a board:

(https://forum.librepilot.org/index.php?action=dlattach;topic=1793.0;attach=3791)

Of course the board is perfectly still.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on August 04, 2016, 12:59:26 pm
Hello TheOtherCliff
The Revolution is set failsafe. If you happen engines are 40% to land slowly.
I think it might then be your second option (is code that watches RTB course) OR problem on the battery. 
(the engines were switched off at the place where took off, only the 25 meters high)

Hello Mateusz
The mast that I was very good. stiff and well fixed.
I do not have yet the OPlink, but in the future I will buy one.

Hello F5soh
I did a test with a pocket compass I have, and this buzzer does locking the pole of the compas when it approaches. After I took buzzer drone, the compass of the revolution was better than GPS. So I could leave PositionHold without buzzer.


So what seems to be the problem is the battery that has shut down the engines. ( I guess)


Thank you so much.

Title: Re: Revo not arming in mode that depends on GPS
Post by: Mateusz on August 04, 2016, 01:42:16 pm
TMGsi

There are usually 2 fail-safe

If it happens that your receiver has fail-safe, then it is probably triggered when you go out of range.
I don't know what happens when you are in Return to Base (RTB) flight mode and receiver triggers fail-safe. I think FrSky default is to set throttle to 10% ?
Also Return to Base climbs up very high first to avoid hitting something right ? So that could additionally increase the range.

Maybe someone else here can clarify if during RTB, fail-safe triggered in receiver can cause motors shut off ?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on August 04, 2016, 02:05:23 pm
Whatever the failsafe i think there is nothing that keep armed when Throttle is low.
Title: Re: Revo not arming in mode that depends on GPS
Post by: Wagsy on August 04, 2016, 03:20:37 pm
Hi.
I have two machines set up with GPS and RTB - Land as the failsafe.
Turn radio off it comes back.
Out of range it comes back till I get control again.
One machine has a Frsky RX and I set it to no pulse.
The other machine has a Crossfire RX and that too is set to no pulse.
No pulse means the RX does not send any last commands to the FC when connection is lost.
The failsafe on the REVO boards are set to (On failesafe switch to flight position 6) which is my RTB and land switch setting.
The throttle setting I have not touched, its still set on -100 in the GCS.

For you motors to stop, maybe the RX stopped working. Maybe the plug into the FC was loose and so as the failsafe on teh FC was set to motors stop, thats what happened. I hot glue my plugs into the FC and RX.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on August 04, 2016, 05:08:50 pm
Hello.
Before you happen to fall, I did failsafe tests (turned off the radio to find the right percentage of throttle to land softly, was perfect in 40%, in my case)
My radio does not have failsafe. It is a simple radio 6ch. (HK6s)

The test RTB that shut off engines, it was not failsafe. For I did RTB test on a football field, pulled away the drone about 70 meters away and about 5 meters high.

The RTB programmed to rise 25 meters and back from where took off.
In the first test was a sucess.
In the second test of RTB, after which rose 25 meters, it returned to the place of takeoff, at the time of land (in the 25 meters high and zero distance the engine turned offO so there was no distance to happen failsafe, the distance was between the drone and the radio was onlu 25 meters high.

Although the failsafe is programmed in revolution with 40% throttle.

I must have failed in some important detail.
Title: Re: Revo not arming in mode that depends on GPS
Post by: Wagsy on August 04, 2016, 11:56:25 pm
So have you got a switch programed on your radio to engage RTB and land.
How have you got your RX (receiver) programed for a failsafe.
If you want the FC to just use it's failsafe, you have to set your RX (receiver) to no pulse or cut etc.
So that means that even if the wires from the RX going to the FC came out in flight, the machine would still come back.
Here is how I have my REVO FC failsafe set, don't need to adjust throttle percentage as it just goes to flight mode 6 = RTB and Land.

But be warned, if it's on the ground and armed, if you then accidentally hit a GPS mode switch or turn the radio off, the machine will start up and fly off :-)
Same if you land and don't disarm it.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on August 05, 2016, 12:35:55 am
My HK6s radio receiver is not programmed. ( I have no option to program anything on the receiver)
All programming (in my case) is only on board revolution.

The radio has a key 2 positions.
position 1 = stabilized
position 2 = sometimes configured to PositionHold, sometimes RTB, sometimes Rate, sometimes VelocityRoam. (every time I needed to do another test with fight mode, had to enter the GCS and change)

As for the failsafe also in GCS put 40% throttle.

Everything in the GCS, nothing on the receiver.

The radio also has a potentiometer.
I also used for flight modes this key, I could have up to 4 modes, but is slower at the time of change and risky.

The failsafe with 40% throttle, have to disarm when lands. If you turn off the radio without disarm, trigger 40% even accidentally. Pay attention to this.
at the befinning I always forget.
Title: Re: Revo not arming in mode that depends on GPS
Post by: Wagsy on August 05, 2016, 01:18:10 am
You should not have to set 40% throttle, just set it to your RTH flight mode.
I would recommend you get yourself something like a Taranis radio and a Frysky D4R II RX.
You will never outgrow the radio and the RX can send signal strength and voltage back to the radio which then speaks to you.
I have 6 flight modes programed into 3 switches which override each other depending on what mode you are in.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TMGsi on August 05, 2016, 01:53:26 am
yes Wagsy, that's my goal.

A dream.

I do not let RTB failsafe because the flight modes that relies on GPS are not fully calibrated.

I'm having trouble leaving the totally green compass.

Now, fly in Rate mode, and make the maneuvers is also another dream.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on August 07, 2016, 11:19:22 pm
I had assumed that lipo alarm buzzer was piezoelectric.  I'm surprised it's not.

Looks like you can see small disturbances even 20cm away.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on August 07, 2016, 11:51:06 pm
So it came back in RTB and them motors shut off instead of landing.  I guess you have FlightModeSettings.ReturnToBaseNextCommand set to "Land".

What you describe can happen if the AltitudeHoldSettings.ThrustLimits or VtolPathFollowerSettings.ThrustLimits are set too high.  When the Min value is too high, and the FC has reduced the throttle all the way down to Miin, but it sees that it is still climbing, it can decide to disarm and shut the motors off for safety.  I haven't read the computer code for that section in a long time, but it that might happen, and it would be worse if the battery was freshly charged, or a lighter battery than normal.  In those cases, it climbs even more than normal.
Title: Re: Revo not arming in mode that depends on GPS
Post by: tony092 on August 25, 2016, 01:12:13 am
Hi, I have also some problems to arm in mode that depends on GPS. Seems I can't arm until I have 7 Satellites. Is there a possibility to start to flight without these 7 satellites I mean in a complementary mode then to pass in GPS mode after? (without to have to reconfigure the flight mode on the field). However thanks for this topic which help me to start because I had also the pb with the buzzer perturbing the magnetometre.
Title: Re: Revo not arming in mode that depends on GPS
Post by: hwh on August 25, 2016, 02:51:19 am
Not really.  The problem is say you arm and take off in a non-gps mode.  Then you flip the flight mode switch to the gps mode before the gps has come online and your quad flies away because the gps is wrong.  The only safe thing is to prevent arming with the gps not ready.

Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on August 27, 2016, 05:17:46 am
And even if you don't use a GPS flight mode, a large change in the quality of the fix can cause a significant change in simple Attitude mode leveling.  I had a change like this cause a large bank angle tilt and a crash into a tree.
Title: Re: Revo not arming in mode that depends on GPS
Post by: tony092 on August 27, 2016, 05:14:17 pm
Thanks hwh & TheOtherCliff for your answers
Title: Re: Revo not arming in mode that depends on GPS
Post by: clintonh on September 29, 2016, 11:03:45 am
If there is a GPS flight mode configured into the flight mode switch, Revo will not arm unless:
- Configuration -> Attitude -> Settings -> "Attitude Estimation Algorithm" is set to "GPS Navigation (INS13)"
- HomeLocation is set
- Mag (magnetometer) is calibrated
- Mag is green color in system health
- GPS is green color in system health

Besides that, all the high current motor wire pairs (and triples) must be twisted together with the pair becoming one cable.  If not, you may get a "fly away".

I recommend that you play with "Velocity Roam" flight mode because it is simple, safe, and more interesting than "Position Hold".  If you leave sticks in the middle it is the same as Position Hold.

Hello, is there a picture example of what you mean by twisting motor wire pairs please?
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on October 17, 2016, 08:58:06 am
All thick wire pairs need to be twisted, each pair into a single cord.

Battery to connector, battery connector to PDB, PDB to each ESC, and the 3 wires from each ESC to it's motor twisted into a single cord too.
Title: Re: Revo not arming in mode that depends on GPS
Post by: QC102 on November 03, 2016, 05:45:00 am
I found my city and my home. I typed my city "go to place:"

But it was a red line that I think goes through my contry.

This red line is normal?

I may have missed this - but if not.... Type your  home number and street address in the TOP  slot  where is says GO TO MY PLACE - its should  fetch up  your street at least.. but remeber to zoom in  about 70%.
Title: Re: Revo not arming in mode that depends on GPS
Post by: joani on December 15, 2016, 01:26:48 pm
Friend I have the same problem, in the estimation modes use the complement more compas (librepilot 16.Rc2), because the GPS mode 13 does not respond: I happen to do all the relevant steps, locate the location gps, calibrate all sensors and I put on the GPS 13 mode but when I go to the display the display of this moves for all sides does not hold the horizon, which does not happen with the complementary mode: what can it be? Every time you change from an estimation mode it is necessary to re-calibrate all the sensors ??
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 16, 2016, 01:50:00 am
It is not necessary to recalibrate just because you change "attitude estimation algorithm".

If you are using an I2C aux mag, you must change mag settings board rotation to either pitch=180 (or to roll=180, yaw=180).  If you do not, your artificial horizon will twist and flip constantly.  Even with it set correctly, you may see 5 degrees or so of horizon tilt and some small shaking.  That is normal.
Title: modo gps 13 no work!!
Post by: joani on December 16, 2016, 11:46:40 am
Friend sorry for my poor English, I manage to calibrate all the senses, at least that seems in the complementary mode and very well, however the autonomous modes do not: I put the gps13 configuration at the end of calibrating all the senses, return to the menu Prinsipal And the horizon begins to shake is not still, what is due?
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on December 16, 2016, 12:14:41 pm
See answer just above and this page:
https://librepilot.atlassian.net/wiki/display/LPDOC/INS13+-+GPS+Navigation

You need a Mag without alarms while motors are running.
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 16, 2016, 08:09:39 pm
A little bit not level (5 degrees maybe) and a little bit of shake (2 degrees maybe) is normal.
Title: Re: Revo not arming in mode that depends on GPS
Post by: joani on December 17, 2016, 08:36:52 pm

Okey friend changed the orientation of the mag, but this is pointing forward like the controller of sea 0 degrees, because it should change the orientation of the mag ??, do not make sense
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 18, 2016, 07:38:42 am
Different board inside different brand GPS has magnetometer mounted different ways.  Some need 0,0,0 and some need 0,180,0 because mag chip is mounted differently.

Real question is "did it fix it for you?"  :)
Title: Re: Revo not arming in mode that depends on GPS
Post by: joani on December 18, 2016, 11:25:32 am

Okay but the module comes with an orientation arrow, in apm2.6, the gps module has an arrow and this must be in the same orientation as the controller. Forward, but good friend I'll see what happens
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 18, 2016, 12:00:03 pm
All orientation arrows on all boards should point forward, but then the configuration needs to be told that THIS kind of GPS/mag has the mag chip mounted upside down, so you tell the configuration that the mag board rotation is 0,180,0.
Title: gps 13 no queda quieto
Post by: joani on December 22, 2016, 12:52:01 pm
Hello, do not log the horizon in gps 13 mode, calibrate the sensors, but when we return to the screen of prisiod this does not stay, not so with the other modes, the complementary for example
Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on December 22, 2016, 01:19:23 pm
Looks normal, the complementary only uses the gravity measured from Accelerometers and INS13 as the name says, uses 13 inputs to compute the Attitude estimation.
https://librepilot.atlassian.net/wiki/display/LPDOC/INS13+-+GPS+Navigation

Some quotes from previous messages that answered your question:
If you are using an I2C aux mag, you must change mag settings board rotation to either pitch=180 (or to roll=180, yaw=180).  If you do not, your artificial horizon will twist and flip constantly.  Even with it set correctly, you may see 5 degrees or so of horizon tilt and some small shaking.  That is normal.

A little bit not level (5 degrees maybe) and a little bit of shake (2 degrees maybe) is normal.
Title: Re: Revo not arming in mode that depends on GPS
Post by: joani on December 22, 2016, 03:12:45 pm
My friend, what I read in many comments that the calibration of the accelerometer has to be quiet, which I almost never do I hold with the hand and the later I record, but my hand shakes, that can be part of the problem too? , There is no magnetometer that one can have on hand and save
Title: no gps 13 oscila el horizonte
Post by: joani on December 22, 2016, 03:15:24 pm
What I am going to do in the last instance is to remove it from the drobne and calibrate it in a fixed position
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 22, 2016, 04:40:07 pm
All calibrations (except magnetometer calibration) should be done with vehicle sitting level on table or ground, not in your hand.  You cannot hold it still enough and level enough.

Also: when Complementary (Basic) attitude estimation is enabled, it should be placed on table or ground immediately after plugging in the battery because the gyros get calibrated then (the fast blinking LEDs tell you it is doing gyro calibration).  It is smart enough to wait till it sees that it is not moving to do the gyro calibration.  It does not have to be level for gyro calobration, but it does have to be completely motionless.  Then again when you arm in complementary mode it must be a table or the ground to be completely motionless.
Title: Re: no gps 13 oscila el horizonte
Post by: TheOtherCliff on December 22, 2016, 04:53:17 pm
I am trying to understand what the problem is that you are having.

Magnetometer calibrations should be done with it mounted in the vehicle so that vehicle mag fields are taken into account.  When using INS13 the first issue is that ATTI and STAB stay red until both GPS and MAG turn green.  After that, the horizon in the GCS Flight Data page begins to work.  Even when the vehicle is level and motionless you will see some small tilt (maybe 5 degrees) and some small motion (maybe 2 degrees).  If the horizon is flipping all over and upside down, then your mags are not configured correctly.  If horizon never works, it may be that your GPS or mag is not green.

If you give more details and keep it all in one thread, we can help you get it working.  :)
Title: Re: no gps 13 oscila el horizonte
Post by: joani on December 25, 2016, 03:36:57 pm

Thanks for answering all my concerns. Now I am testing a walkera 250 runner with gps, to see if with this result it is easier the autonomous modes. However I will resume the Revo Mini and see what I can do
1. You can pretty much cc3d the frame and calibrate accelerometer, gyroscope and leveling on a fixed bench, keep them and mind lacc3d and calibrate the magnetometer as I said.
And I will see after the oscillation of the gsc when I finish calibrating the gps13 mode. Ahh happy holidays !!! ;D ;D ;D
Title: Re: Revo not arming in mode that depends on GPS
Post by: joani on December 26, 2016, 12:42:16 am

Friend because it can not be configured rth and assisted gps that gives configuration error, however if I put rth and I do not put gps assisted, if it takes, that is due to this and gps13

Title: Re: Revo not arming in mode that depends on GPS
Post by: f5soh on December 26, 2016, 01:37:18 am
Quote
And I will see after the oscillation of the gsc when I finish calibrating the gps13 mode.

Little oscillations in PFD are normal using INS13
Title: Re: Revo not arming in mode that depends on GPS
Post by: TheOtherCliff on December 26, 2016, 05:15:16 am
Generally it is not recommended for a beginner to have RTH (we call it RTB) connected to failsafe.  It is OK to have it on the switch, but it is good to test everything with VelocityRoam first.  There is much to learn about failsafe and GPS build and configuration so that it is better for a beginner to have failsafe drop to the ground than risk crashing into something or flying away because he did not set it up and test it completely.
Title: Re: Revo not arming in mode that depends on GPS
Post by: andyp on December 30, 2016, 07:45:14 am
I built my quad in the last 2 weeks and it was my first one beyond the of the shelf ones. In this article I found a lot of useful information, because I had the same problems as described here and they caused a lot of pain and frustration. Could we attach this information to the GPS setup page or make at least a link to this article? Also the aux and onboard mag calibration video is really helpful and should be available in the user manual.

As an engineer I like the article about the extended kalman filter, but it should be placed also somewhere in the user manual, as it provides useful and important information. I also find a description of the attitude estimation algorythm very important, because this is not self explaning.

Just mentioning this because it took me quite a while to find this.