HMC5883l Archives - ARM Learning

The Honeywell HMC5883L is a surface-mount, multi-chip module designed for low-field magnetic sensing with a digital interface for applications such as lowcost compassing and magnetometry. The HMC5883L includes our state-of-theart, high-resolution HMC118X series magneto-resistive sensors plus an ASIC containing amplification, automatic degaussing strap drivers, offset cancellation, and a 12-bit ADC that enables 1° to 2° compass heading accuracy.

The I2C serial bus allows for easy interface. The HMC5883L is a 3.0×3.0x0.9mm surface mount 16-pin leadless chip carrier (LCC). Applications for the HMC5883L include Mobile Phones, Netbooks, Consumer Electronics, Auto Navigation Systems, and Personal Navigation Devices.

The HMC5883L utilizes Honeywell’s Anisotropic Magnetoresistive (AMR) technology that provides advantages over other magnetic sensor technologies. These anisotropic, directional sensors feature precision in-axis sensitivity and linearity.

These sensors’ solid-state construction with very low cross-axis sensitivity is designed to measure both the direction and the magnitude of Earth’s magnetic fields, from milli-gauss to 8 gauss. Honeywell’s Magnetic Sensors are among the most sensitive and reliable low-field sensors in the industry.

Here is a typical module

HMC5883L

Layout

This example layout shows an HMC5883 module connected to an Arduino Due

Arduino Due and HMC5883L

Code

This example uses the Adafruit libraries – the unified sensor and the HMC5883, you can add these libraries in the Arduino IDE using the library manager

[codesyntax lang=”cpp”]

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_HMC5883_U.h>

/* Assign a unique ID to this sensor at the same time */
Adafruit_HMC5883_Unified mag = Adafruit_HMC5883_Unified(12345);

void setup(void)
{
Serial.begin(9600);

/* Initialise the sensor */
if(!mag.begin())
{
/* There was a problem detecting the HMC5883 ... check your connections */
Serial.println("Ooops, no HMC5883 detected ... Check your wiring!");
while(1);
}
}

void loop(void)
{
/* Get a new sensor event */
sensors_event_t event;
mag.getEvent(&event);

/* Display the results (magnetic vector values are in micro-Tesla (uT)) */
Serial.print("X: ");
Serial.print(event.magnetic.x);
Serial.print(" ");
Serial.print("Y: ");
Serial.print(event.magnetic.y);
Serial.print(" ");
Serial.print("Z: ");
Serial.print(event.magnetic.z);
Serial.print(" ");
Serial.println("uT");

// Hold the module so that Z is pointing 'up' and you can measure the heading with x&y
// Calculate heading when the magnetometer is level, then correct for signs of axis.
float heading = atan2(event.magnetic.y, event.magnetic.x);

// Once you have your heading, you must then add your 'Declination Angle', which is the 'Error' of the magnetic field in your location.
// Find yours here: http://www.magnetic-declination.com/
// Mine is: -13* 2' W, which is ~13 Degrees, or (which we need) 0.22 radians
// If you cannot find your Declination, comment out these two lines, your compass will be slightly off.
float declinationAngle = 0.22;
heading += declinationAngle;

// Correct for when signs are reversed.
if(heading < 0)
heading += 2*PI;

// Check for wrap due to addition of declination.
if(heading > 2*PI)
heading -= 2*PI;

// Convert radians to degrees for readability.
float headingDegrees = heading * 180/M_PI;

Serial.print("Heading (degrees): ");
Serial.println(headingDegrees);

delay(500);
}

[/codesyntax]

Testing

Open the serial monitor

Heading (degrees): 34.00
X: 17.45 Y: 6.91 Z: -41.53 uT
Heading (degrees): 34.20
X: 17.27 Y: 7.18 Z: -41.22 uT
Heading (degrees): 35.18
X: 16.18 Y: 8.82 Z: -41.53 uT
Heading (degrees): 41.19
X: 13.82 Y: 9.82 Z: -41.73 uT
Heading (degrees): 48.00
X: 12.55 Y: 9.27 Z: -41.94 uT
Heading (degrees): 49.07
X: 16.82 Y: 4.45 Z: -42.24 uT
Heading (degrees): 27.44
X: 15.91 Y: 0.82 Z: -43.57 uT
Heading (degrees): 15.55
X: 15.00 Y: 2.64 Z: -43.27 uT
Heading (degrees): 22.57

Links

GY-271 HMC5883L 3-Axis Compass Magnetometer Sensor Module 3V-5V for Arduino

The Honeywell HMC5883 is a surface mount multi-chip module designed for low field magnetic sensing with a digital interface for applications such as low cost compassing and magnetometry. The HMC5883 includes our state of the art, high-resolution HMC118X series magneto-resistive sensors plus Honeywell developed ASIC containing amplification, automatic degaussing strap drivers, offset cancellation, 12-bit ADC that enables 1° to 2° compass heading accuracy.
The I2C serial bus allows for easy interface

FEATURES

 12-Bit ADC Coupled with Low Noise AMR Sensors Achieves 5 milli-Gauss Resolution in ±8 Gauss Fields
 Built-In Self Test 
 Low Voltage Operations (1.6 to 3.3V)
 I2C Digital Interface
 Lead Free Package Construction
 Wide Magnetic Field Range (+/-8 Oe)
 Fast 116 Hz Maximum Output Rate

Schematic and Connection

Code

[codesyntax lang=”javascript”]

I2C1.setup( { scl: B6, sda: B7 } );
var compass=require("HMC5883").connect(I2C1,C11,0);

compass.setGain(1);
compass.setup(0,0);

compass.reads(function(a) {console.log(a);});

[/codesyntax]
Output
{ “x”: 43.24000078439, “y”: -125.12000226974, “z”: -164.68000298738, “overflow”: false }
{ “x”: 46.92000085115, “y”: -124.20000225305, “z”: -162.84000295400, “overflow”: false }
{ “x”: 15.64000028371, “y”: 111.32000201940, “z”: -234.60000425577, “overflow”: false }
Links

https://www.espruino.com/HMC5883

HMC5883L Triple Axis Compass Magnetometer Sensor Module 3V-5V For Arduino GY-273

HMC5883l

An Arduino Due and HMC5883L sensor example

Espruino and HMC5883l example