OlliW wrote:THX a lot for these many suggestions
as regards the calib, well, I think it's not like that I didn't try to squeeze as much info out of the wiki as I could
I might not have been clear enough in some points
* I didn't fly on or from the balcony, I just wanted to tell that I've ensured that the M4 had outside temperature
* Q: Let's assume "perfect" calibration of both the acc and mag at RT, could the changes in calibration at the sub-degree temperatures explain all or any of the above effects? (I wouldn't think so, but ...)
* I understand that the "original" toilet bowl is typically due to having a mag and some currents during flight, but that the AQ uses the mag just at startup. However, my thought was that if the mag at startup gives south wrong by, let's say, 15° that then the navigation controller would apply the correction signal into a direction off by15^, would soon after realize that the craft doesn't move into the expected direction, would again calculate a correction which is wrong by 15° and so ... I could imagine that this mechanism could lead to flying circles. So, my question. I rephrase:
Q: If the mag predicts south wrong by e.g. 15°, what would the consequences for PH be?
(the 15° is just totally arbitrary number I've chosen for the sake of the example)
I will try to post a photo as soon as I can, but it's really close to the reference build.
I have a BT installed, is this maybe know to worsens GPS reception? (wouldn't think so, but ...)
As regards the HAcc and VAcc thing, I might have underestimated this ... I admittedly assumed that the solid blue led was chosen such that it would work "reasonably". I'll see if I get a telemetry log (working extensively in the outside is not very convenient currently LOL). Maybe I should try to better understand accuracy and resolution of GPS (I assumed that, as usual, resolution is much better than accuracy also for GPS).
Q: With the blue led on, what accuracies can one expect for the horizontal and vertical position hold? (3 m???)
Maybe it could be worthwhile to consider some blue led signaling from which one can deduce the GPS accuracy, such that it blinks faster the better the GPS, or blinks faster with every 0.5m better accuracy, or so ... I would find it inconvenient if one would have to bring to the flying field a "car full of electronics" (i.e a lapi and run telemetry to check H/VAcc) just to fly the M4-LB ...
Q: A question as regards the RTH: Is it supposed to also bring back the aircraft to the original altitude of the home position? I read the wiki to say yes, but never could see that happen.
Thx for your help, and sorry for these questions, I feel a bit stupid myself![]()
Olli
- Of course, wrong, bad MAG, is the one of the reasons for the "TB" effect.
After the init-phase, we have GYRO and ACC and GPS-Heading to get the best heading.
If we are too far off with the MAG, it makes trouble...
- The blue LED tell's you only, minimum accurancy for POS-Hold/navigation is reached.
Yes, not a bad idea with blinking... but I'm not sure, how many different quality-signales, you can detect.
- Did you carefull check your throttle factor ? Did you have your throttle, in mid-pos (700 +- throttle dead band (40))?
If you are out of the 660 - 770, you will tell the controller rising or sinking!
- For RTL and altitude, you must be in 700+- throttle dead band! Then switch to RTL, now the M4 will also try to reach the altitude.
- The conditions in your Video are far away from good for GPS! I'm not sure, what you expect from the GPS
