[TheOtherCliff]

Read previous post. 
Mag gets power and ground from the GPS wires.

[joani]

 Una pregunta amigo, cuando hace esos movimientos en la pantalla después de calibrar todo ?, y uno lo quiere hacer volar cuando se va para todos lados y uno con el radio trata de equilibrarlos , son los mismo movimientos que se ven en el  gcs?quiero decir que el drone no se queda quieto porque la altitud  oscila continuamente en el gsc ?si  el mismo estuviera estático como en los modos complementarios , esto no sucedería? . Yo trate  de equilibrarlos con la rotación virtual y la orientacion  del mag pero mejoro y ahora otra ves esta loco: solo que ahora si pongo estabilizado y gps asistido , no me arma motores , si lo quito si los arma

[TheOtherCliff]

Sorry.  I am having difficulty understanding the Google translation.

Also, I think you mean Attitude, not Altitude.

Small amounts of movement in the PFD (Flight Data screen) are normal.  Up to say 5 degrees of movement is OK.  PFD showing it flipping and flopping upside down is not OK.

[joani]

okey amigo , me pasa lo mismo ejejje.no hay problemas , pues si es actitud , me equivoque.Pero sucede que yo lo había dejado bien , se acuerda? y lo tuve sin probar una semana , ahora lo quise volar y como que descalibro nuevamente y sin modificar nada .
Yo  lo tengo  en 180;90;180 ,así lo había dejado y funcionaba en gps13 siempre, pero nunca llegue a probarlos  los modos autónomos  .Los probaba como andaba un rato de noche en  mi casa es estabilizado con gps asistido , pero los sábado lo llevo a un lugar descampado-resulta que empece a tocar la orientación virtual de attitude. si estaba tirado para adelante 5 grados , le tiraba para atrás el cabeceo  5 grados, pero lo probé y no me convenció, asi que lo deje como estaba , 0;0;0 :pero ahora es como que se descompuso nuevamente

[TheOtherCliff]

180,90,180 es una configuración muy extraña para el magnetómetro.

Si todo ("controlador de vuelo" y "GPS con mag") está montado normalmente (las flechas apuntan hacia adelante) entonces:
- Si usted tiene un GPS con I2C mag, conectado a FlexiPort (generalmente PixHawk o APM) debe utilizar 180,0,180 (o 0,180,0)
- Si usted tiene DJI o GPSv9 tipos de GPS, entonces usted debe utilizar 0,0,0

Si se configuran incorrectamente, el PFD se pondrá al revés en la página "Datos de vuelo" ("Flight Data") (una vez que ATTI y STAB pasen a verde).

[nkout]

I am also thinking of gps/mag. I am only looking sellers shipping to Greece. Among the following GPSs, which one do you suggest?

https://drotek.com/shop/en/drotek-parts/512-ublox-neo-m8-gps-hmc5983-compass.html

http://www.ebay.com/itm/Original-DJI-GPS-Module-for-Naza-M-V2-Multirotor-Autopilot-Flight-Control-/172294421532?hash=item281d8c3c1c:g:kSsAAOSwqfNXowk0

http://www.ebay.com/itm/DJI-GPS-Compass-Module-for-DJI-NAZA-M-Lite-Flight-Control-System-/251862698572?hash=item3aa42fca4c:g:hPEAAOSwofxUbb15

Is the drotek gps compatible with revo?
Is there any advantage of naza v2 compared to v1, making sense for the extra price?

Nikos

[TheOtherCliff]

The first one is OK but it needs two ports (MainPort for GPS and FlexiPort for mag).  That means one less port when you want to do GPS and mag and OSD all at the same time.  Maybe you cannot do all at once if you use this GPS.  This GPS is a PixHawk style which LP does support.  It has the more recent Ublox Neo8 GPS inside it.  It can see many kinds of GPS type satellites, not just USA GPS satellites.  You will get more satellites if you use this.  It also seems to have a worse "jumping" problem when there are large flat things like metal roofs (even when it is outside) to reflect the signals and confuse it.  This kind of mag (I2C) sometimes (infrequently) has compatibility problems with Revo ports and needs shorter cable or external pullup resistors.

The second one is too expensive if you ask me.    I have bought and tested the Naza Lite version, not this V2.  I would not get this one for price and maybe incompatibility?

The third one is also OK but be aware that this real DJI Naza brand GPS uses an older version of GPS component.  This real DJI Naza brand uses Ublox Neo6 GPS and only sees USA GPS satellites, but these orbit the whole earth, so that usually isn't a very large problem.  Maybe some Russian or Chinese users can post whether USA GPS works well for them.  I have heard complaints about USA GPS when far away from USA, but don't know if they are true.

[nkout]

Thanks a lot for the clear answer.

I will think a little bit about it....

I already have a neo6m gps working with my revo (but never tested in flight, only at ground), so i will check if revo's internal mag can work with my setup. I have a 45cm quad. I will try to twist all power cables for less interference.

And if any issues, I will order a new gps with mag.

Thanks in any case!

Nikos

[TheOtherCliff]

It sticks in my mind that the GPS V2 can additionally work when plugged into the V2 bluetooth hub?

[TheOtherCliff]

Power distribution board can be a problem if it is not designed to minimize magnetic fields.  I suspect that the best ones usually are designed with + on top and - on bottom (or the other way), so that one sheet is one and the other sheet is the other.

[nkout]

Regarding power interference to mag, can a solution be putting revo away from frame using a GPS folding mount?

[TheOtherCliff]

Power interference is the main source of mag interference.  PDB (power distribution board) is only one place to be careful.  Of course the thick high current wires are the other main places.  I mention the PDB because you can twist wires, but the only way to fix the PDB is to buy a different brand.

Yes, you could move the Revo up much higher instead of mounting a GPS/mag up high.  I don't know of anyone that has tried it though.  Lots of longer wires to Revo are a pain, but these wires are low current and basically don't matter when compared to the high current wires.  Just make sure to keep them away from the Revo, because a careless small wire that is close to the mag sensor would have an affect since it is so close.  Once it is mounted and powered up with a flight battery, you can test it by watching mag scope in GCS while wiggling small wires (keep Revo motionless).

Also move power wires down lower where reasonable.

If Revo is mounted on a pole be careful of resonance like a plucked guitar string; motor vibration at certain RPMs can drive resonance.  Also move high current wires down as low as possible and twist them all, including battery cable.

The distance from nearest power wires to GPS/mag on my good flying F330 (2212 motors, 3s2500 lipo) quad is 18cm.  For larger motors or larger battery = more current, I would try to make it farther.

Final test is to watch GCS mag scopes while you run individual and all motors with multicopter firmly held down and motionless (must have props on).  I am going to try this with a quad by screwing it down to wooden deck today.  Maybe tying it down will be motionelss enough.

[HighAltitude]

I've tried several options to get a reliable GPS/Mag signal. My initial strategy was to try to get by as cheaply as possible.
I twisted the power wires between the battery and the lower frame/PD board and the ESC's and motors insofar as their length allowed, mounted the Revo board on an auxiliary upper deck above the upper frame board on 25 mm spacers, and recalibrated all the sensors several times, but still couldn't get a reliable Mag signal from the onboard Mag sensor. 
I've also tried a couple of  mini OP GPS and uBLOXNEO-M8N modules, which worked OK for a GPS fix, but didn't solve the Mag problem.     
Since I have reliable PWM connections between my Orange receivers and my Revo boards, I haven't wanted to deal with trying to get a PPM connection set up to free up more Flexi-IO port connections for other uses.  This leaves only the Main and Flex port available for GPS, Mag, and OSD I/O, which precludes adding extra connections between the modules and the FC board. In addition, I'm not confident enough in my soldering skill to add connections to the M8N modules without damaging them.  Additionally, I try to minimize the rats nest of wiring that is otherwise inevitable with extra connections. 
So, I bit the bullet and bought genuine DJI NAZA GPS/Mag units for both my quads.  They weren't egregiously expensive and plug and play into the Main port after substituting 4 pin JST for the DJI connector, which was an easier soldering job than working with the teensy weensy solder pads on the circuit board.  They've calibrated easily and I now have reliable GPS flight modes.
It's been interesting and educational to try out the various options, but, in retrospect, would have been cheaper and simpler to get NAZA units from the beginning.

[vk4tec]

Did you have to make the uBLOXNEO-M8N modules not NMEA ?

Andrew

[TheOtherCliff]

He is using a Revo FC.  Revo does a GPS configuration automatically.