0 Tuning Posted by Ken Anderson on January 6, 2013 at 10:01am I've looked but can't find an answer.What do I, D and P refer to please? You need to be a member of diydrones to add comments! Join diydrones Email me when people reply – Follow
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There's a good article about it on Wikipedia too (not ArduCopter specific).
http://en.wikipedia.org/wiki/PID_controller
http://code.google.com/p/arducopter/wiki/AC2_Tweaks
and
http://www.diydrones.com/forum/topics/arducopter-tuning-guide
Here are some of the basics, have a read :)