MPU6050 FreeIMU library
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Async MPU6050 library
My port of the MPU6050 library samples the chip at 500Hz using Timer. Async I2C is achieved using a custom I2C library, which supports I2C calls from interrupts. Link given below:
Difference between this port and the Arduino MPU6050 library
The getMotion6 function only returns a copy of the last obtained readings, which is sampled at a frequency of 500Hz (adjustable). Hence it can be called at any frequency without taxing the I2C.