Arduino and 3-axis HMC5883L magnetometer

3-axis magnetometer HMC5883L and Arduino

The tutorial shows how to handle a digital magnetometer with an Arduino.

 

In this example we used the following elements:

 

Connect the sensor with Arduino:

The module communicates using the popular I2C bus. Thus, the connection to the Arduino needs to be done in the following way:

 

Module HMC5883L Pin Arduino
VCC 5 V
GND GND
SCL A5
Traffic A4

 

 

 

Wiring diagram of the magnetometer with Arduino Uno.

 

Program for Arduino

In the example, we used the following code:

 

#include  //I2C library 

#define address 0x1E //address module for I2C HMC5883L 

void setup(){ 
 Serial.begin(9600); //initialize serial communication 
 Wire.begin(); //initialize the module 

 //Configure the appropriate sensor mode 
 Wire.beginTransmission(address); //open connection 
 Wire.write(0x02); //select mode register 
 Wire.write(0x00); //continuous measurement 
 Wire.endTransmission(); 
} 

void loop(){ 

 int x,y,z; //variables for the three axes 

 //Setting the address to read data 
 Wire.beginTransmission(address); 
 Wire.write(0x03); //select register 3, the register MSB of X-axis 
 Wire.endTransmission(); 


 //Read data for each axis, two entries on the same axle 
 Wire.requestFrom(address, 6); 
 if(6<=Wire.available()){ 
 x = Wire.read()<<8; //MSB of X-axis 
 x |= Wire.read(); //LSB X axis 
 with the = Wire.read()<<8; //MSB of axis 
 s |= Wire.read(); //LSB axis 
 y = Wire.read()<<8; //MSB of Y-axis 
 y |= Wire.read(); //LSB Y axis 
 } 

 //Display data on serial monitor 
 Serial.print("x: "); 
 Serial.print(x); 
 Serial.print(" y: "); 
 Serial.print(y); 
 Serial.print (": "); 
 Serial.println (); 

 delay(250); //delay between measurements 250 MS 
}

 

The results of the program can be seen below:

 

A screenshot of the serial monitor.

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