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HMC5883L example

The HMC5883L is a 3-axis magnetometer. The most common include usage of the chip is as a digital compass to sense direction or using them to detect ferrous metals.

HMC5883L

HMC5883L

/*
Analog input 4 I2C SDA
Analog input 5 I2C SCL
*/

Code

#include <Wire.h>

#define address 0x1E //I2C 7bit address of HMC5883

void setup(){

Serial.begin(9600);
Wire.begin();

//Put the HMC5883 IC into the correct operating mode
Wire.beginTransmission(address);
Wire.write(0x02);
Wire.write(0x00);
Wire.endTransmission();
}

void loop(){

int x,y,z

//begin reading data
Wire.beginTransmission(address);
Wire.write(0x03); //select register 3, X MSB register
Wire.endTransmission();

//Read data from each axis, 2 registers per axis
Wire.requestFrom(address, 6);
if(6<=Wire.available()){
x = Wire.read()<<8; //X msb
x |= Wire.read(); //X lsb
z = Wire.read()<<8; //Z msb
z |= Wire.read(); //Z lsb
y = Wire.read()<<8; //Y msb
y |= Wire.read(); //Y lsb
}

//Print out values of each axis
Serial.print(“x: “);
Serial.print(x);
Serial.print(” y: “);
Serial.print(y);
Serial.print(” z: “);
Serial.println(z);

delay(250);
}

Links

HMC5883L at Amazon US

HMC5883L at Amazon UK

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