| Problem | Datasheet Solution | |----------------------------------|------------------------------------------------------------------------------------| | Magnetometer reads only zeros | HMC5883L requires a 5ms delay after power-on (see datasheet timing diagram) | | Gyroscope drifts quickly | ITG-3200 needs factory calibration offsets stored in registers 0x3D to 0x42 | | Accelerometer shows wrong range | Default is ±16g. Set range register 0x31 to 0x00 for ±2g (ADXL345 datasheet) |

The GY-85 uses the to communicate with microcontrollers like Arduino or Raspberry Pi. Each sensor has its own unique 7-bit address:

The GY-85 datasheet PDF can be found on various online platforms, including: