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:

 

  1. #include  //I2C library 
  3. #define address 0x1E //address module for I2C HMC5883L 
  5. void setup(){ 
  6.  Serial.begin(9600); //initialize serial communication 
  7.  Wire.begin(); //initialize the module 
  9.  //Configure the appropriate sensor mode 
  10.  Wire.beginTransmission(address); //open connection 
  11.  Wire.write(0x02); //select mode register 
  12.  Wire.write(0x00); //continuous measurement 
  13.  Wire.endTransmission(); 
  14. } 
  16. void loop(){ 
  18.  int x,y,z; //variables for the three axes 
  20.  //Setting the address to read data 
  21.  Wire.beginTransmission(address); 
  22.  Wire.write(0x03); //select register 3, the register MSB of X-axis 
  23.  Wire.endTransmission(); 
  26.  //Read data for each axis, two entries on the same axle 
  27.  Wire.requestFrom(address, 6); 
  28.  if(6<=Wire.available()){ 
  29.  x = Wire.read()<<8; //MSB of X-axis 
  30.  x |= Wire.read(); //LSB X axis 
  31.  with the = Wire.read()<<8; //MSB of axis 
  32.  s |= Wire.read(); //LSB axis 
  33.  y = Wire.read()<<8; //MSB of Y-axis 
  34.  y |= Wire.read(); //LSB Y axis 
  35.  } 
  37.  //Display data on serial monitor 
  38.  Serial.print("x: "); 
  39.  Serial.print(x); 
  40.  Serial.print(" y: "); 
  41.  Serial.print(y); 
  42.  Serial.print (": "); 
  43.  Serial.println (); 
  45.  delay(250); //delay between measurements 250 MS 
  46. }

 

The results of the program can be seen below:

 

A screenshot of the serial monitor.

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