[Ardunio]MPU9250

手邊的MPU9255是九加一軸感測器
基本上就是MPU9250加上溫度，
MPU9250是三軸加速度計加上三軸陀螺儀加上三軸羅盤
挺威的，

今天測試拿掉範例的中斷，直接存取Row data
看起來應該正常，但因為時間趕，得多測幾次看看有沒有bug。

MPU9250規格書
https://www.invensense.com/products/motion-tracking/9-axis/mpu-9250/

[Ardunoi]Wire.h

Wire Library

This library allows you to communicate with I2C / TWI devices. On the Arduino boards with the R3 layout (1.0 pinout), the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. The Arduino Due has two I2C / TWI interfaces SDA1 and SCL1 are near to the AREF pin and the additional one is on pins 20 and 21. As a reference the table below shows where TWI pins are located on various Arduino boards. Board I2C / TWI pins Uno, Ethernet A4 (SDA), A5 (SCL) Mega2560 20 (SDA), 21 (SCL) Leonardo 2 (SDA), 3 (SCL) Due 20 (SDA), 21 (SCL), SDA1, SCL1 As of Arduino 1.0, the library inherits from the Stream functions, making it consistent with other read/write libraries. Because of this, send() and receive() have been replaced with read() and write().