TinyNorthToe

TinyNorthToe.ino

#include <TinyWireM.h>
#define HMC5883L 0x1E //0011110b, I2C 7bit address of HMC5883

void pulse(int n){
  while(n-- > 0) {
    digitalWrite(1,HIGH);
    delay(1);
    digitalWrite(1,LOW);
    delay(1);
  }
}

void setup()
{
  TinyWireM.begin();
  
  TinyWireM.beginTransmission(HMC5883L);
  TinyWireM.send(0x00);
  TinyWireM.send(0x70);
  pulse(TinyWireM.endTransmission());
  
  TinyWireM.beginTransmission(HMC5883L);
  TinyWireM.send(0x01);
  TinyWireM.send(0xA0);
  pulse(TinyWireM.endTransmission());
  
  TinyWireM.beginTransmission(HMC5883L);
  TinyWireM.send(0x02);
  TinyWireM.send(0x00);
  pulse(TinyWireM.endTransmission());
}
 
void loop()
{  
  TinyWireM.requestFrom(HMC5883L,6);
  unsigned int x = ((TinyWireM.receive() <<8) | TinyWireM.receive());
  unsigned int y = ((TinyWireM.receive() <<8) | TinyWireM.receive());
  unsigned int z = ((TinyWireM.receive() <<8) | TinyWireM.receive());
  
  TinyWireM.beginTransmission(HMC5883L);
  TinyWireM.send(0x03);
  TinyWireM.endTransmission();
  delay(10);
}