I'm starting this discussion since there's a lot of confusion and lack of knowledge about PID settings and control theory, so, you can find here a table with several different frames, multycopter types and firmware versions in order to let you start flying and tuning your copter. Be aware that this are not rigid values. Each person has it's own configuration and flying preferences, but, if you have an identical configuration, you may start using those values and tune them for yourself. If you'd like to share your configuration, specs and settings, as well as flying tests, weather conditions and videos, I'll try to keep it up to date.
Ok, I have inserted a googledocs file, never worked with this before :) It looks easy, here's the link
Well after some serious trial and error I'm really back at square one now...I will start another post for my issues, but after reverting to my previous board with known working settings I'm actually experiencing some of the same symptoms. Weird drift, VERY unstable throttle response, and basically an uncontrollable helicopter. Please see my newly started thread and comment if you have any suggestions.
Here is my new post with my hexacopter woes...
Thanks again guys,
need some help. finished my quad again with new parts. when i get it up in the air at first its good then it starts to wobble real bad and then falls out of the air.
was original arducopter but i rebuilt it with 3dr arms and 468 landing gear now. 850kv and 10x4.7 apc props.4s1p 2300mah a123 pack. apm1.4 with 1280 switched to 2560. castle creations 18amp esc's. 2.6 firm ware.
stabilize p4.5 i0.0 imax 40.satb d 0.0
rate p.110 i0.0 d0.0 imax 5.0
rate p started at .18 and im down to .110 and it seems to need to go lower. just set stab p down to 3.75 and rate p to .090 and going to go try to fly.
well that didnt work. still trying new settings. still reading. you know ive been at this since last nov/dec and i still havent had a flight longer than 30 secs.
Michael: I think something must be wrong with your airframe/electronics. This should work right out of the box with the default settings on a standard frame like that. The only thing I can think of is that your 4S pack is quite overpowered for that frame, which might require lower P settings. But it sounds like you've already tried that, so I'm a bit stumped. I've got about a dozen of those frames and they all worked fine first time on the stock settings.
well everything was good when i first put it together last nov. it flew well until the esc's started dying one at a time until i lost all the ones i had along with bending a couple of frame arms. so after taking several months getting it rebuilt now im trying to get it to fly again and it will but not for long. when i try to yaw it, then the 2 back motors flip it forward. without yaw it just starts rocking in all directions and flips over.
remember the voltage for a123 batteries is 3.3 volts so its not like having a 4s lipo.
unless you can think of something i missed i will take it apart again and start over.
Ah, sorry, I didn't know that about a123 batteries (never used them). I definitely sounds like something funky with at least one of the motors/ESCs. When you test them individually, they all work exactly the same, even at high speed?
as far as i can tell yes they do. no probs doing the calibration.
i did do a live cal for location yesterday. the yellow gps line changed by like 80 degs and now it looks like it used to back when. im going to try some new settings after work today. i will let you know how it goes and where im at settings wise.
tryied to fly again today. a little windy. still cant get it to fly any longer than 15-20 seconds without rocking and fliping over. its a little slower,but still a long way to go imo. going to try again in the morning.
this really is rather strange michael, i wonder if you could post a video of an attempted flight and a log.
it really should stabilize itself, and even with the pid values slightly off it should wobble around level without flipping over. one thing i have read is that 2.7 seems to be a bit sensitive to vibration - how is APM mounted in the quad?
if the motors/escs arent to blame then its got to be the attitude detection thats not working properly - a video and log of a flight should make it pretty obvious whats wrong.
well sorry no video. but ill put in the last 3-4 logs. went out to our flying park today and i couldnt even get up in the air. i need to take off the 468 gear and put on the regular landing legs.
motors are all good. the esc's are all good afaik. not having problems like i was with the diydrone ones. im still on 2.6 as i didnt want to put in another variable since im trying to track down whats going on. the apm is held to the g10 plate with nylon screws. no rubber or anything like that.
these were the largest of the latest files. if you need other info let me know.
hope this helps.
so would it help any to disconnect the gps or mag when trying to get this thing to fly.
should i upgrade to the latest software.