Help! Revolution + GPS Neo M8N with compass.
« on: May 20, 2017, 11:06:41 am »
Hi, I have configured my quadricopter, but although it's ok, when I go to arm the engines do not turn, I attach a video of me and possibly pictures.
Video:
The problem is resolved by completely removing the GPS, in which case the drone works and starts the engines (ready to fly).
I can not solve this problem, please help me.

Here is the list of components:
---
-Revolution
---
-Neo M8N with compass: http://costruzionedroni.it/ublox-m8n-cc3d-revo-gps-antenna-con-bussola-integrata?search_query=m8n&results=1
---
-ESC: Turnigy Multistar 30A: https://hobbyking.com/it_it/turnigy-multistar-30-amp-blheli-multi-rotor-brushless-esc-2-6s-v2-0.html
---
- Engine: https://hobbyking.com/it_it/turnigy-d2836-8-1100kv-brushless-outrunner-motor.html
---
-Battery: Turnigy 4.0A 4S 14.8V

please help me. :(

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #1 on: May 20, 2017, 11:29:02 am »
These are the configurations of the drone, screen for screen.
thank you.









f5soh

  • *****
  • 3695
    • LibrePilot
Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #2 on: May 20, 2017, 11:47:12 am »
Hi,

If you want to share your configuration, simply post the config file.
File > Export UAV Settings
We can see all the settings, not only the one you posted in a few screenshots.

You can also made a log while trying to arm and starting motors.
Tools > Start log and after a few minutes trying, Tools > Stop log

Please note you should not use the Complementary+Mag**** algorithm, use INS13 instead.
Just a remark for later use ^^, not related to the issue.


Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #3 on: May 20, 2017, 12:03:00 pm »
Hi, thanks for the answer, so do you think the problem is the algorithm used?

f5soh

  • *****
  • 3695
    • LibrePilot
Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #4 on: May 20, 2017, 12:06:08 pm »
Quote
Please note you should not use the Complementary+Mag**** algorithm, use INS13 instead.
Just a remark for later use ^^, not related to the issue.

No, just a remark

Please post the config file and log

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #5 on: May 20, 2017, 12:09:26 pm »
Hi, thanks for the answer, I now configure the drone with the GPS, because now I was testing the drone without GPS.
Thank you.

f5soh

  • *****
  • 3695
    • LibrePilot
Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #6 on: May 20, 2017, 12:13:40 pm »
For testing GPS usage or not you just need to switch algorithm from INS13 to Complementary, assuming you do not have GPS based flightmodes configured. Others settings can still.

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #7 on: May 20, 2017, 04:29:58 pm »
Your GPS is not working at all.  The red X means it is not talking at all, probably wired wrong.  FYI: red block (different than red X) is OK since it means "I am talking, but have not got a GPS position fix yet".

Your aux mag is working.  Since it gets power from the GPS cable, so you probably just need to switch the Tx and Rx wires around in the GPS cable.  Use a model knife to carefully lift up the tiny tiny plastic flap that locks the wire into the connector.  Use a magnifying glass to see it.  Only lift the flap barely high enough to slide the pin/wire out.

Oh, I see that this is a GPS made for Revo.  In that case use a magnifying glass to look inside the MainPort connector on Revo to see if there are bent pins.

f5soh

  • *****
  • 3695
    • LibrePilot
Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #8 on: May 20, 2017, 09:46:22 pm »
Quote
Your GPS is not working at all.


Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #9 on: May 20, 2017, 10:42:17 pm »
So the gps works, but is there another problem right?
Tomorrow, I make all the configurations with (log) and export uav settings.
Thank you.

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #10 on: May 20, 2017, 11:25:41 pm »
I saw this and didn't look further.

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #11 on: May 21, 2017, 04:58:44 pm »
So the gps works, but is there another problem right?
Tomorrow, I make all the configurations with (log) and export uav settings.
Thank you.

Which flight mode were you trying to "ARM" in ?

And thanks for posting the GPS link. At least I know which GPS to buy now!

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #12 on: May 21, 2017, 05:26:21 pm »
That GPS style (I2C mag) does work, but it uses two ports (GPSv9 and DJI use only one port, GPSv9 are expensive or not generally available) we also find that some brands require soldering pullup resistors to make it reliable.  The good thing about that one is that it has Revo/OP/LP connectors already on it so there is no soldering.

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #13 on: May 22, 2017, 10:34:51 pm »
Quote
Which flight mode were you trying to "ARM" in ?

And thanks for posting the GPS link. At least I know which GPS to buy now!

Hi, do not remember, why do you ask for this? The flight modes are marked in the images above, I armed the engines in mode 1.
Thanks.

Re: Help! Revolution + GPS Neo M8N with compass.
« Reply #14 on: May 29, 2017, 02:26:20 pm »
Quote
Which flight mode were you trying to "ARM" in ?

And thanks for posting the GPS link. At least I know which GPS to buy now!

Hi, do not remember, why do you ask for this? The flight modes are marked in the images above, I armed the engines in mode 1.
Thanks.

When I did manage to arm, I could only do it in the non-GPS flight more. I could not arm in any of the GPS flight mode.