So I've been unhappy with how aggressive the throttle is on 2.8.1, plus my quad sinks, and climbs, and sinks and climbs, over and over. And I feel like I'm often giving it waaaay to much throttle just to hold altitude.
So in the new Arducopter Pids screen I cranked up both Altitude Error P and Thrust Rate P, from 300 to 330.
I was greeted today by really nice throttle response when the quad leapt into the air with wild abandon.
I switched to ALT-Hold from stabilize mode.
As I floundered about fighting the stupid wind gusts (shouldn't have flown really, to gusty), suddenly the quad stopped obeying me and gyrated violently, I switched back to stabilized, hit disarm and dropped the quad so it wouldn't flop itself into the lake. It was only a meter or two in the air.
So I have a couple questions.
Is Throttle rate P the correct thing I need to adjust so I get better throttle response?
Is Altitude Error P what caused my Death Wobble?
Replies
Hi I am a very new quad flyer with a 3dr Aruducopter kit straight from the box. I apologise if this is the wrong place to post but I have been following the “damping “thread with interest
. My machine appears to be fine in hover, stabilise, rtl etc but very twitchy in Alt hold. No tuning done yet so default 2.91 values.
I have attached a log file and wondered if someone could have a look analyse and come back with a few pointers?
As I said very new and on a big learning curve on flying, log analysis, tuning and everything else!
Thanks in advance
Tony
2013-03-07 12-47 1.log
Much better. I think jacking up the Alt-Hold IMAX really helped. Lowered the Throttle Rate P a big chunk too. Now it does terrain following about a foot off the ground.
When the ground descends, the copter takes it's time to drop down and follow the topography, but as the ground climbs (flying up a hill), the copter climbs right up maintaining a foot or two height. It's a beautiful thing to watch.
Gave up on worrying about the data spikes in Sonar. Just copied Randy's install, used a cable with 3 separately shielded wires (A/V cable), and mounted it between the rear motors. Seems to work well enough.
I should check the wiki before posting sometimes. Sorry.
http://code.google.com/p/arducopter/wiki/AC2_alt_hold_PID
Still wondering about the throttle response question though.