9DOF，Kalman滤波器的源程序，通过加速度传感器、陀螺仪、磁场三种传感器的输出来实现姿态仿真。-Aim of my code: There are a lot of projects available on the web for 1 axis-filtering, but not much in 3 dimensions. And I had a lot of trouble getting useful and relevant information. For the