Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on March 31, 2012 at 3:48pm

Did you calibrate your compass in the MP and set the declination?

DeveloperPermalink Reply by Marco Robustini on March 31, 2012 at 4:11pm

1) compass is not calibrated as they should
2) your declination is wrong
3) a magnetic field parasite wreaks havoc with the compass

Permalink Reply by Helldesk on March 31, 2012 at 4:24pm

Firstly, the declination ought to be set. Then the compass has to be put through a "learning experience", one way or the other, before it can be relied on in flight. One way to do this is to make a flight where you fly around, turning this way and that, and then landing and disarming. This saves the "offsets" the magnetometer requires for a degree of reliability. After that you can fly in Simple Mode.

Permalink Reply by Mark Slater on March 31, 2012 at 4:46pm

The Declination is set and the compass does seem to be accurate. I've had six flights so far on this firmware but I'll put some more flights on there tomorrow and see what happens

Permalink Reply by Martin Szymanski on March 31, 2012 at 6:44pm

Also look at vibration possibility to the IMU as well as gauss interference by a wire nearby the magnetometer. Even a IMU with a close magnet can throw it off.

Permalink Reply by Wessie on April 2, 2012 at 4:04am

Mark, let me guess, you also fly rc helis, right?

I had EXACTLY the same problem, it boggled my brain for the longest time until it one day clicked.

the Simple mode works 100%. its your(my) brain that is(was) the problem.

I took off, rotated 90 degrees, then flew forward, and nothing went in the expected directions. Only then did i realise that I was no longer facing the same direction as Switch -on.  I had a natural tendency to turn my body in the direction of the quad. If you do that , your brain thinks : forward on the stick is away from me. But it isnt. think about it.

when i gave the quad to a total noob, he managed simple mode SO quickly, but my head had a problem with it for some reason.

Even after i realised what I was doing wrong, I had ro FORCE myself to keep my feet planted and not turn my body, and then had to keep saying out loud "red leg forward, red led forward" etc. Sounds silly, but thats what I had to do to get my old, misused brain to co-operate.

Hope your problem is as simple as that, and that you dont have some hardware or setup problem. let us know what transpires...

Wessie

DeveloperPermalink Reply by Marco Robustini on April 2, 2012 at 4:36am

Yes, there are two modes for the simple, the "normal" and the "super".
The default is "normal simple", where the quad is driven axle where it is armed, giving "stick elevator up" (nose down) the quad moves in the direction parallel to where he pointed the nose when you are armed with the engines... works like moving the cursor on the screen with the mouse.
In the "super simple" by issuing the command "stick elevator up" (nose down) the quad-directional axis moves to the point where the engines are armed, and always towards us (in this case, you should always drive it by turning your body towards him) but only if the quad is over 20 meters from where we armed the engine.
When we do work for filming the pilot (me) always works in "NORMAL SIMPLE", in this way the cam operator that has the commands "YAW / CAM PITCH / CAM ROLL" (with a second tx)  may want to rotate the quad like leaving me a chance to drive it every time, where I want and safely.
After takeoff, with a tx switch i activated at the same time "normal simple" and the three commands to the second operator (with trainer option).
For this reason i don't like the "SUPER SIMPLE", but it is very useful for novices.
Obviously all this work if the compass and the gps work properly.