Wooow, man I just registered to say thank you sooo much to you. You made my day, not even day ,you made my week You are the one super smart guy I spent 6 hours to get what I want from gyro and finally came across your comment. It was suffering from gimbal lock when I hold it straight upwards and tilt it front/back and right/left. Right/left was affecting the values for front/back. After this change it is solved as I see. Partially, I write it because someone might encounter the the same problem and my description could be found in google. Thank you again.