Hi!I know this has been discussed before but somehow I could not find the old discussion.After having calibrated my APM 2.5, when I go out flying, the middle position of my throttle stick makes my quad gain altitude like a rocket. I use WKM and Naza on my other frames, so I am used to have the sticks centered (by springs) and get perfect altitude hold with no inputs.I tried to trim down the throttle but even thats not enough to keep the copter from rising.Is there anything I can do with PIDs or calibration to make the copter hover on middle stick input?Thank you very much!Joerg
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Got everything tuned and flying beautifully in Stabilise and Alt hold(loiter,position). My flight times were less than desireble so I went to this:
4S 3300
NTM Prop Drive Series 28-30A 750kv / 140w
30Amp ESCs
10 4.7 props
The second setup has a ton of power for my setup and flew 16 min mild forward flight almost entire time. In stabilize it flies great but when I switch to loiter or any alt hold function it looks like i am getting an irregular pulsating of the motors and the alt hold is not very stable. I have started to lower the setting on the PID menu for ALT hold. Specifically the one relative to the weight and thrust of the copter. Both changed significantly. I can't seem to get it to go away. Any thoughts would be appreciated.
Yes, i agree with robert. if you're talking about it shooting up when you're in stabilize mode then you should adjust the THR_MID value. So for example if your copter hovers as 35% of throttle then you should change that parameter in the Mission Planner's Config, Adv Parameter List and make it 350. By the way, you can't make that number less than 300 or more than 700.
If you're talking about alt hold mode then it's likely vibration and you should turn on the RAW messages in the dataflash and then make a short stabilize flight and then post your logs here and we can confirm that it's vibration that's the issue.
Replies
I have recently changed from this
Got everything tuned and flying beautifully in Stabilise and Alt hold(loiter,position). My flight times were less than desireble so I went to this:
NTM Prop Drive Series 28-30A 750kv / 140w
The second setup has a ton of power for my setup and flew 16 min mild forward flight almost entire time. In stabilize it flies great but when I switch to loiter or any alt hold function it looks like i am getting an irregular pulsating of the motors and the alt hold is not very stable. I have started to lower the setting on the PID menu for ALT hold. Specifically the one relative to the weight and thrust of the copter. Both changed significantly. I can't seem to get it to go away. Any thoughts would be appreciated.
jjohow,
Yes, i agree with robert. if you're talking about it shooting up when you're in stabilize mode then you should adjust the THR_MID value. So for example if your copter hovers as 35% of throttle then you should change that parameter in the Mission Planner's Config, Adv Parameter List and make it 350. By the way, you can't make that number less than 300 or more than 700.
If you're talking about alt hold mode then it's likely vibration and you should turn on the RAW messages in the dataflash and then make a short stabilize flight and then post your logs here and we can confirm that it's vibration that's the issue.
Wrong forum, but I think what you want it to adjust THR_MID.