fix mpu6050 sensor initialization issue#494
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In my case the sensor (mpu6050), was not initialized correctly and returns erroneous data.
The proposed changes works fine.
In particular, I'm not sure why the second byte (0x80 == 1000 0000) is messing up the initialization.
As I understand from the documentation (page 40):
https://pdf1.alldatasheet.com/datasheet-pdf/view/1132807/TDK/MPU-6050.html
the seventh bit of register 0x6b should be set to one:
0x80 = 1000 0000
but it doesn't work that way.