Dear all,
I built DIY H-quad with APM 2.6 in it and tested many times in Europe (where I am based at this moment). This quad is for supporting my social-ecological research in Bornean rain forest (i.e. mapping with indigenous communities for protection). It worked well during testings with different flying mode (stabilized, Loiter, RTL, waypoints). Due to the long flights and regulation, I deconstruct the copter and re-construct it again in Indonesia now. Tried to do the whole processes again from the beginning (i.e. Tx calibration, ESC calibration (without mission planner) and radio calibration, accel calibration and compass calibration via MP 1.2.96.
I tried to make it fly today and it yaws and drifts during take off, so basically I was not able to make it hovering as it's too dangerous I think (never happened before). Tried to check the "tilt" on motors and frame etc. and make sure that everything's not tilting. I noticed that when I do compass calibration, it gives me lots of points (or let's say it keeps on giving me points) despite that I didn't move at all the H-copter (APM). So at the end, it gives me around 250 points. I thought it might be one of the problem.
Another addition that I just noticed and I am not sure if it's normal? My MP shows that the yaw degree is above 100 (to be precise between 102 and 104). I don't have any clue if it's normal or not. However, during the tests, it never gives me such "huge" number.
Another thing is, where I do test now is close to the high voltage power plants, I have a suspicion that it might have something to do with that? where the magnetic field from the power plants might influence the calibration? Thank you so much for any input.
I would like to know if somebody else has (ever) the same problem? and maybe some ideas of solution?
I am lucky enough that I am still with slow internet connection now, any information and clue would definitely be much appreciated. Thank you very much
warm regards,
Rai
Replies
The quadcopter shoud not be stationary for the entire compass calibration. In mission planner, in the compass calibration screen, there is a link to a video demonstration on how to calibrate the compass. You should watch the video and copy the procedure. I would redo both the accelerometer and RC calibrations too. Performing an auto trim procedure after both calibrations will help too. You can read up on that in the APM manual.
Dear bblatter,
Thanks so much for your help and info. Indeed, I have performed this calibration in non-stationary condition before and it worked well (during the testings). However, now as I am in the field, even when the H-quad is in the stationary condition, the compass calibration at MP gives me "lots" of points. I will redo everything again soon in the different place, let's see what will happen. Thanks lot bblatter !