Basic background on APM2 = 1 week. I have been experimenting with Different PID settings from 1.0 - 3.5 default I = 0.80 and IMAX = 30 without any success. My configuration is dji f450 with Gaui 330x Motors 1050kv and 10" props. Any starting point from anyone?
Most people are using the defaults very successfully, what problems are you having when trying the defaults?
It will gradually move away from the indicated position just like the stabilised mode will. (There was some very light breeze during this test). It kinda doesn't correct it self ( I always take off when the gps lock led is solid). With some other settings it just dived for a foward flight. I will however make some more tests and if i find out how to download logfiles from the onboard memory i will post them. I don't know how to read them though.
It should attempt to stay within around 3m x 3m. I've had it not responding to loiter at all but there seemed to be some problem with my GPS, rebooting fixed it. If you have a higher P then it should try stay put more aggressively but maybe with too much correction.
If you're not getting any response to switching to Loiter then maybe something else is wrong? You should see a slight tilt as the quad moves away from the point where you switched to loiter.
I am pretty sure that the GPS is functional. I noticed a pendulum effect around the locked area. I did bring down the P to 1.2 at some point but nothing succesfull. I read that a lot of guys use values of 0.2 - 0.6. I am gonna try in that range later tonight when the wind is down for supper. Will come back with some log files and flight data. In order to post a picture how the flight plan route on the google map i need to have telemery or it saves the flight log in the gps and can be viewed on the MP?
A .log file, .gpx file and .kmz file (Google Earth) will be saved on the APM2, a tlog will be saved on the PC if you use telemetry. My Rate Loiter P is 2.0, I is 0.08, D is 0.4 and IMAX is 30
The mediatek is just has so much latency that it's hard to keep the gains high enough to get the copter to stay in one place. The new uBlox w/patch antenna solves this in a big way. If Loiter is really important, I would switch.
Here is my log and kmz of the latest flight. I had the loiter P at about 1.500