MPU6000 Arduino Library
http://myquadcopters.blogspot.my/2014/04/quadcopter-5-accelerometer-and-gyro.html
MS5611 Arduino Library
https://github.com/jarzebski/Arduino-MS5611
https://code.google.com/r/mspirit-ardupilot/source/browse/libraries/AP_Baro/AP_Baro_MS5611.cpp?r=ea2cfbb4f8d3a1893597bebf8e5ee3fa2cb242ea
HMC5883L Arduino Library
https://github.com/jarzebski/Arduino-HMC5883L