text: #ifndef __COMPASS_H_
  #define __COMPASS_H_
  
  /*
  
  MinIMU-9-Arduino-AHRS
  Pololu MinIMU-9 + Arduino AHRS (Attitude and Heading Reference System)
  
  Copyright (c) 2011 Pololu Corporation.
  http://www.pololu.com/
  
  MinIMU-9-Arduino-AHRS is based on sf9domahrs by Doug Weibel and Jose Julio:
  http://code.google.com/p/sf9domahrs/
  
  sf9domahrs is based on ArduIMU v1.5 by Jordi Munoz and William Premerlani, Jose
  Julio and Doug Weibel:
  http://code.google.com/p/ardu-imu/
  
  MinIMU-9-Arduino-AHRS is free software: you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your option)
  any later version.
  
  MinIMU-9-Arduino-AHRS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
  more details.
  
  You should have received a copy of the GNU Lesser General Public License along
  with MinIMU-9-Arduino-AHRS. If not, see <http://www.gnu.org/licenses/>.
  
  */
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  void Compass_Heading();
  #ifdef __cplusplus
  }
  #endif
  
  #endif