Dof is the number of independent coordinates in the mechanical system. Three-axis acceleration, three-axis gyroscope, and three-axis magnetometer, so it's a 9-dof.
Acceleration can measure the motion of an object, rise and fall, horizontal and diagonal. It can also recognize gestures after careful calculation. The gyroscope can detect the angle of an object and obtain the static position. The typical application products are the balance car and mobile phone. A magnetometer can obtain absolute direction by relying on the earth's magnetic field. The compass is based on the principle of the magnetometer. With a sensor as powerful as the 9-dof, it is possible to try something as complex as a moving robot.
9-Dof Sensor Card is a high performance 9-axis motion tracking card from Longan Labs, which is based on MPU-9250. The MPU-9250 provides, 3-Axis gyroscope 3-Axis accelerometer 3-Axis magnetometer. Hence, the MPU-9250 is a 9-axis motion tracking device that combines a 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetometer and a Digital Motion Processor™ (DMP).
Longan Cards is a unique open source development platform designed by Longan Labs. As a plug and play development platform, Longan Cards allows you to quicky build wide array of prototypes and applications in no time. A full set of Arduino libraries and plenty of example codes are available to play with Longan Cards platform.