Pitch value changes with change in GyroZ

[frozenmafia]

Thanks for your amazing library.

I am using your library for balancing drone. For eg my drone is at zero pitch and zero roll. But as soon as I get angular rotation in z axis. pitch and roll value increases for a moment and return backs to normal. But that moment is enough for my drone to crash. I would be higly obliged if you provide me any guidance to solve this issue Thanking you.

[rfetick]

Hello,

Could it be due to centrifugal force? It could be the case if the MPU6050 is far from the rotation center and at high Z-axis rotation speed. Values of gyroscopes and accelerometers at this critical moment will give you a hint on the cause. If it is indeed the centrifugal force you might see accelerometer values to increase on X or Y axis.

As a reminder, the library provides correct angular values in the case where the gravity is the major acceleration. If other forces (such as centrifugal force) become a non negligible source of acceleration, then angular computations are affected.

Another cause might be a slight misalignement of your MPU6050 with the frame of the drone. The Z-axis rotation is projected on the X and Y axis (as the sine of the angular misalignement). In this case, these are the gyroscope values on X and Y that increase at the critical moment you described.

Cheers,

Romain