first commit

ATMEGA_COMPAS/ATMEGA_COMPAS.ino

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+#include <Wire.h>
+
+#define Addr 0x1E               // 7-bit address of HMC5883 compass
+
+void setup() {
+  Serial.begin(9600);
+  delay(100);                   // Power up delay
+  Wire.begin();
+  
+  // Set operating mode to continuous
+  Wire.beginTransmission(Addr); 
+  Wire.write(byte(0x02));
+  Wire.write(byte(0x00));
+  Wire.endTransmission();
+}
+
+void loop() {
+  int x, y, z;
+
+  // Initiate communications with compass
+  Wire.beginTransmission(Addr);
+  Wire.write(byte(0x03));       // Send request to X MSB register
+  Wire.endTransmission();
+
+  Wire.requestFrom(Addr, 6);    // Request 6 bytes; 2 bytes per axis
+  if(Wire.available() <=6) {    // If 6 bytes available
+    x = Wire.read() << 8 | Wire.read();
+    z = Wire.read() << 8 | Wire.read();
+    y = Wire.read() << 8 | Wire.read();
+  }
+  
+  // Print raw values
+  Serial.print("X=");
+  Serial.print(x);
+  Serial.print(", Y=");
+  Serial.print(y);
+  Serial.print(", Z=");
+  Serial.println(z);
+  
+  delay(500);
+}
+