HMC5883L Compass mit I2C

Hier ein Beispielcode:

[code]
#include <Wire.h> //I2C Arduino Library

#define addr 0x1E //I2C Address for The HMC5883

void setup(){
 
  Serial.begin(9600);
  Wire.begin();
 
 
  Wire.beginTransmission(addr); //start talking
  Wire.write(0x02); // Set the Register / Das Register auswählen
  Wire.write(0x00); // Tell the HMC5883 to Continuously Measure
  Wire.endTransmission();
 
}


void loop(){
 
  int x,y,z; // Daten der 3 Achsen
  int s; // Status
  char id, id1, id2; // Identification Register A, B, C
 
  //Tell the HMC what regist to begin writing data into
  Wire.beginTransmission(addr);
  Wire.write(0x03); //start with register 3.
  Wire.endTransmission();
 

 // Lesen der 3 Achsen, je 2x 8bit (3x 2 Register)
  Wire.requestFrom(addr, 6); // Anfrage an Gerät (addr) für 6 bytes
  if(6<=Wire.available()){
    x = Wire.read()<<8; //MSB  x
    x |= Wire.read(); //LSB  x
    z = Wire.read()<<8; //MSB  z
    z |= Wire.read(); //LSB z
    y = Wire.read()<<8; //MSB y
    y |= Wire.read(); //LSB y
  }

  // Lesen von Status und IDs
  Wire.beginTransmission(addr);
  Wire.write(0x09); // Starten mit Register 9
  Wire.endTransmission();
  Wire.requestFrom(addr, 4);
  if(4<=Wire.available()){

    s = Wire.read();
    id = Wire.read();
    id1 = Wire.read();
    id2 = Wire.read();

  }
    float heading = atan2(-y, x);
    float declinationAngle = 39.85/1000;
   
    heading += declinationAngle;

    float headingDegrees = heading * RAD_TO_DEG;
    if (headingDegrees < 0) headingDegrees += 360;
  
   delay(100);

 
  // Daten ausgeben
  Serial.println("*****************************");
  Serial.print("Kompass Grad: ");
  Serial.println(headingDegrees);
  Serial.print("X Value: ");
  Serial.println(x);
  Serial.print("Y Value: ");
  Serial.println(y);
  Serial.print("Z Value: ");
  Serial.println(z);
  Serial.println();
  Serial.print("Status: ");
  Serial.println(s, DEC);
  Serial.println();
  Serial.print("ID-A: ");
  Serial.println(id);
  Serial.print("ID-B: ");
  Serial.println(id1);
  Serial.print("ID-C: ");
  Serial.println(id2);
  Serial.println("*****************************");
 
  delay(500);
}
[/code]