Successful test of the Cheerson CX-20 (APM + Arducoper firmware inside)

I have successfully tested the Cheerson CX-20 Auto-Pathfinder (also called the Quanum NOVA). This quadcopter uses an APM v2.52 with the ArduCopter v3.1.2 already installed. It fly very well and all the Arducopter features are working very well....

Above, a video during the maiden flight of the CX-20 has been taken with a  GoPro 3 "Black Edition" mounted on the anti-jello mounting base.

Test conditions: Wind 22 Km/h gusting 33 Km/h 

The APM 2.5.2 (with an external magnetometer) with the Arducopter v3.1.2 handle very well the CX-20, the flight is very stable in loiter mode in spite of the strong gusts.

Below the factory PID installed:

The flight modes set by default:

I have added a telemetry datalink and tested sucessfully the Droid Planner v2.0 (Android) and the Mission Planner (PC).

More infos at:

http://diydrones.com/profile/JeanLouisNaudin

https://github.com/jlnaudin/x-VTOLdrone

Stay tuned,

Jean-Louis

Views: 105718

Comment by Simon Wunderlin on May 29, 2014 at 4:23am

How did you connect the telemetry modem, does it have DF13 or header pin connector. is the connector compatible with 3DR cables?


Developer
Comment by Jean-Louis Naudin on May 29, 2014 at 9:31am

You will find a full tutorial for connecting the telemetry to the Quanum NOV or to the CX-20 Auto-Pathfinder:

HERE

I hope this will help you.

Regards,

Jean-Louis


MR60
Comment by Hugues on May 29, 2014 at 10:19am

Jean Louis, is there an anti vibration foam between APM and the frame? If not this is a miracle recipe for FlyAway's...


Developer
Comment by Jean-Louis Naudin on May 29, 2014 at 10:28am

@Hugyes: Yes there is a double layer of anti-vibration foam between the APM box and the frame. see below:

Jean-Louis

Comment by Rob_Lefebvre on May 29, 2014 at 11:20am

Just a caution about this.

Apparently there are several build variations of this machine, and it's hard for customers to know what they're going to get.  One of the variations uses a board that is not APM-compatible at all.  It's some unknown system with an STM32F1 processor (so it's not PX4-compatible either).  People have been unsuccessful even connecting USB to a computer to find out what firmware is running on it (don't even know if it's Arducopter).

Some of the variations have questionable practices, like a USB plug obscuring half of the GPS patch.


MR60
Comment by Hugues on May 29, 2014 at 12:39pm

is it possible to just buy the plastic frame ?


Developer
Comment by Jean-Louis Naudin on May 29, 2014 at 1:18pm

@Rob: My version is the latest one with the Arducopter v3.1.2 and FULLY compatible with the APM2560.

I have NO PROBLEM about this...

Regards,

Jean-Louis

Comment by Rob_Lefebvre on May 29, 2014 at 1:26pm

Yes, thanks JL, I did see all that in your blog. I just wanted to point out to other people that there is this issue.

It's a mystery why the GPS isn't in that pod on top.

My guess at this point, is that originally the GPS was in the pod, and the mag was onboard.  The mag suffered interference from the PDB, causing the toiletbowling. Then, since there are not cheaply available GPS/Mag combo units that fit, they decided to put a mag up in the pod, forcing the GPS down below.

It's all pretty shoddy engineering.


Developer
Comment by Jean-Louis Naudin on May 29, 2014 at 1:34pm

@Rob: The compass is not placed on the same board than the GPS like in the 3DR GPS, in the case of the CX-20, the GPS is fully decoupled from the compass, so there is no reason to put the GPS on the pod placed on the top because the GPS is not sensitive to the magnetic field In this case only the magnetometer is placed on this upper pod so as to be far from any magnetic interferences. This is a good point here...

Jean-Louis

Comment by Rob_Lefebvre on May 29, 2014 at 1:43pm

The GPS can still be affected by things going on in the other electronics, and can benefit from some separation. Some electronics can generate 1.3GHz interference.  Plus on some of them now, as I said, there is a USB connector blocking half of the patch antenna.

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