This is a discussion re the ArduCopter-3.1 AutoTune feature. A place for people to report successes and failures, ask questions and get answers.
The AutoTune wiki page is here.
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George,
Sorry you're having troubles. Next best thing to do is try a fresh radio calibration.. you want to make sure that not only the min/max PWM values are all spot on, but so is the mid_rc. After that, you want to make sure your copter is hovering at 50% throttle while in AltHold. FYI the logs won't show it go in to AutoTune mode, so don't sweat that. Also, that level of noise is perfectly acceptable, and I don't think noise would stop the autotune, but depending on how bad it is could potentially cause other issues that end up to AutoTune stopping prematurely.
If radio calibration doesn't work and verifying mid-throttle for AltHold hover doesn't work, attach a log and someone can have a look. Also, any chance you can upgrade your firmware to 3.2?
Best of luck!
I read about random APM related stuff for hours last night and I'm thinking I might have accidentally been putting the copter in "auto trim" mode when I was just trying to arm it. It looks like 2 days of rain here so I'll install 3.2 and I'll play with Arm and disarm indoors and recalibrate the radio (for the 10th time - it only takes a few seconds).
I have ch7 on a knob, not a switch. That doesn't matter, right? It still goes to about 1850 when I turn it all the way. Will report back after the weather dries out a bit.
My arm procedure doesn't seem quite right. I wait for blue steady (gps lock) then I do the throttle down and right (yaw right - mode 2) and red keeps flashing and I hold it until blue starts flashing also (I now think that's autotrim - at 15 second point). I thought it meant "i don't want to arm" so then I go down left (yaw left) an then right again and it goes red/blue both solid. I'll experiment with arming some more today. I'll try 6 seconds only.
Hey George,
ch7 on a knob is fine. Also, yes, you're arming in to AutoTrim mode. You should only need to yaw right about ~4 seconds. You will see a Gyro Cal light pattern emit in 3.2 where the arming light flashes quickly a few times between red and blue, and after that stops, you're armed.
6 Seconds is more than enough, 10 second is when the AutoTrim mode is activated.
Be careful playing with arming modes with props on
:) Yeah I know. I always make sure the props are clear and that the USB cable won't get close to the props but I was planning to do this without the battery anyway. I've been flying/tinkering with this home built for several weeks now so I've made most of the mistakes by now. :)
By the way it's my own design and 3D printed. I've had to change the design to stiffen it quite a bit as even though it was plenty strong, it wasn't plenty stiff - especially at the "wrists" near the props.
FWIW I did an auto tune on my x8 I got the following
SP Gain 10.500
RP Gain .0.2305 I .1225 D .9192 Yaw 4.500
Seems to fly quite well on this.
You can. Have the Roll I value be the same value as the Roll P value. 17.5 is a bit high for Stab P IMO, I'd probably start that out with 10 or so, but that's just me.
Sorry wrong place to post what i was going to ask just ignore ..
Hi Brian,
Can you tell me a little more about your copter. Your tune looks a little strange and I agree that your alt hold looks pretty average. It also looks like you are gradually increasing in altitude, I doubt this is messing things up but it is something to look at.
If you have done some other autotunes I would be interested to see them and see if they have the same issues.
By the way, 3DR has started selling the foam they include with the Pixhawk kits. I think they spent a fair bit of time evaluating different foams and gels.
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