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The Wire.beginTransmission() and Wire.endTransmission() are only used when writing data. They should not be used with Wire.requestFrom().
The Wire.requestFrom() does a complete I2C transaction on its own, and when it returns the I2C transaction has completely finished and the received data is waiting in a buffer in the Wire library. The Wire.available() tells how many bytes are in that buffer.

In the next files, the Wire.requestFrom() is encapsulated by Wire.beginTransmission() and Wire.endTransmission(). You can remove those Wire.beginTransmission() and Wire.endTransmission().

• _35_GY85__ITG3205_Gyroscope_07.ino
• _35_GY85_ADXL354_Accelerometer_06.ino

When requesting a single byte, and testing it with: if (Wire.available() <= 1), then it is always true. When there was a problem on the I2C bus and the Wire library could detect it, then Wire.available() would probably return zero. If everything was okay, the Wire.available() would return the same number as requested.

Therefor, all those if (Wire.available() <= ?) can be removed. It is used in the files:

• _34_gyroscope_code.ino
• _34_magnetometer_code.ino
• _35_GY85_HMC5883L_Magnetometer_08.ino
• _24_arduSerie_Arduino_Compass.ino
• _24_arduSerie_Arduino_Bluetooth_Compass.ino
• _34_accelerometer_code.ino
• _34_Sensor_ADXL345_Template.ino