I have a 3dr quad and was out flying around and in Alt_hold and Loiter. The quad will loose fifteen to twenty feet before it really reacts to get it back up to alt. Then it will over shoot and then will slow down dramatically. I will post the Pid settings and if I need to make some changes feel free to tell me.
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Make sure you cover your baro sensor.
Jason
Bradley: You might find this useful: http://code.google.com/p/arducopter/wiki/AC2_Tweaks There is a simulator at the bottom of the screen that will help you understand the effect that PID settings have on the performance of ALT_HOLD. You can just click above or below the copter to simulate a new altitude.
I will update. I had no Idea I was running ancient version. I am using the APM1
Bradley: First, upgrade your Mission Planner! You're using an ancient version (we're now at 1.1.59)
Second, are you using APM 1 or APM 2? I fly with the default 2.5.3 PIDs on a 3DR quad with APM 2 and alt hold is great.