Quadcopter PID calibration

Hi guys ! We are trying to calibrate our quadcopter using this library: http://playground.arduino.cc/Code/PIDLibrary, but we can’t figure out the right coefficients. We tried a lot of different values for the P coefficient, but none of them seems to work… We are running out of idea !

You can check our code here: http://www.luxontower.com/fr/wp-content/uploads/2016/01/Quadcopter.zip

Thanks :slight_smile:

Google "pid tuning" for tutorials.