MAG3110 Archives

In this example we show how to connect a MAG3110 3D magnetic sensor to a MSP-EXP432P401R LaunchPad, the example will use the Energia IDE.

I used a MAG3110 module in this example, which you can see below

The MAG3110 is a small, low-power digital 3D magnetic sensor with a wide dynamic range to allow operation in PCBs with high extraneous magnetic fields. The MAG3110:

Measures the components of the local magnetic field, the sum of the geomagnetic field and the magnetic field created by components on the circuit board
Can be used in conjunction with a 3-axis accelerometer so that orientation-independent accurate compass heading information may be achieved
Features a standard I²C serial interface and is capable of measuring local magnetic fields up to 10 Gauss with output data rates up to 80 Hz

More info – MAG3110 site

Connection

Here is a picture of the launchpad so you can see what pins we are referring to below in the table

launchpad pins1

Module Connection	MSP432 Connection
SDA	J1-10 SDA
SCL	J1-9 SCL
Gnd	J3-22 Gnd
Vcc	J1-1 3.3v

Code

[codesyntax lang=”cpp”]

#include<Wire.h>

// MAG3110 I2C address is 0x0E(14)
#define Addr 0x0E

void setup() 
{
  // Initialise I2C communication as MASTER 
  Wire.begin();
  // Initialise serial communication, set baud rate = 9600
  Serial.begin(9600);
  
  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select control register-1
  Wire.write(0x10);
  // Set active mode enabled
  Wire.write(0x01);
  // Stop I2C Transmission
  Wire.endTransmission();
  delay(300);
}

void loop() 
{
  unsigned int data[6];
  
  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select data register
  Wire.write(0x01);
  // Stop I2C Transmission
  Wire.endTransmission();

  // Request 6 bytes of data
  Wire.requestFrom(Addr, 6);

  // Read 6 bytes of data
  // xMag lsb, xMag msb, yMag lsb, y Mag msb, zMag lsb, zMag msb
  if(Wire.available() == 6)
  {
    data[0] = Wire.read();
    data[1] = Wire.read();
    data[2] = Wire.read();
    data[3] = Wire.read();
    data[4] = Wire.read();
    data[5] = Wire.read();
  }
  
  // Convert the data
  int xMag = ((data[1] * 256) + data[0]);
  int yMag = ((data[3] * 256) + data[2]);
  int zMag = ((data[5] * 256) + data[4]);
    
  // Output data to serial monitor
  Serial.print("Magnetic field in X Axis : ");
  Serial.println(xMag);
  Serial.print("Magnetic field in Y Axis : ");
  Serial.println(yMag);
  Serial.print("Magnetic field in Z Axis : ");
  Serial.println(zMag);
  delay(1000);
}

[/codesyntax]

Output

Open the serial monitor and you should see something like this

Magnetic field in X Axis : 31230
Magnetic field in Y Axis : 32261
Magnetic field in Z Axis : 17665
Magnetic field in X Axis : 30974
Magnetic field in Y Axis : 32517
Magnetic field in Z Axis : 13057
Magnetic field in X Axis : 31742
Magnetic field in Y Axis : 31237
Magnetic field in Z Axis : 18177
Magnetic field in X Axis : 31486
Magnetic field in Y Axis : 32005
Magnetic field in Z Axis : 18689

Links

GY-3110 MAG3110 Triple 3 Axis Magnetometer Breakout Electronic Compass Sensor Module For Arduino

MAG3110

MSP-EXP432P401R LaunchPad and MAG3110 3D magnetic sensor example

Code

Output

Links