Liono Maker
Created March 23, 2019 © GPL3+

digital compass

In this article we will learn how Magnetometer sensor works and how to interface it with a microcontroller like Arduino.

IntermediateProtip1 hour99

Things used in this project

Story

Read more

Custom parts and enclosures

digital compass

explaination of the project.

Schematics

digital compass

it is schematic

Code

digital compass

Arduino
it is a code of digital compass project
/*
 * Program for Arduino Digital Compass using QMC5883
 * Project by: Aswinth Raj
 * Dated: 1-11-2018
 * Website: www.circuitdigest.com
 * Lib. from https://github.com/keepworking/Mecha_QMC5883L
 * WARNING: This code works only for QMC5883 Sensor which is commonly being sold as HMC5883 read article to find the actual name of the sensor you have.
 */

#include <Wire.h> //Wire Librarey for I2C communication 
#include <MechaQMC5883.h> //QMC5883 Librarey is added since mine is QMC583 and not HMC5883

MechaQMC5883 qmc; //Create an object name for the snsor, I have named it as qmc

int ledPins[] = {2,3,4,5,6,7,8,9}; //Array of output pin to which the LED is connected to
char led_count = 7; //Total number of LED pins 

  
void setup() {
  Wire.begin(); //Begin I2C communication 
  Serial.begin(9600); //Begin Serial Communication 
  qmc.init(); //Initialise the QMC5883 Sensor 

  for (int thisPin=0; thisPin <= led_count; thisPin++){ //Navigate through all the pins in array 
    pinMode(ledPins[thisPin],OUTPUT); //Declare them as output 
  }

}

void loop() { //Infinite Loop
  int x,y,z;
  qmc.read(&x,&y,&z); //Get the values of X,Y and Z from sensor 
  
  int heading=atan2(x, y)/0.0174532925; //Calculate the degree using X and Y parameters with this formulae 

 //Convert result into 0 to 360
  if(heading < 0) 
  heading+=360;
  heading = 360-heading;
  
  Serial.println(heading); //Print the value of heading in degree for debugging 

//Based on the value of heading print the result for debugging and glow the respective LED.
  if (heading > 338 || heading < 22)
  {
    Serial.println("NORTH");
    digitalWrite(ledPins[0],HIGH);
  }
  if (heading > 22 && heading < 68)
  {
    Serial.println("NORTH-EAST");
    digitalWrite(ledPins[7],HIGH);
  }
  if (heading > 68 && heading < 113)
  {
    Serial.println("EAST");
    digitalWrite(ledPins[6],HIGH);
  }
  if (heading > 113 && heading < 158)
  {
    Serial.println("SOUTH-EAST");
    digitalWrite(ledPins[5],HIGH);
  }
  if (heading > 158 && heading < 203)
  {
    Serial.println("SOUTH");
    digitalWrite(ledPins[4],HIGH);
  }
  if (heading > 203 && heading < 248)
  {
    Serial.println("SOTUH-WEST");
    digitalWrite(ledPins[3],HIGH);
  }
  if (heading > 248 && heading < 293)
  {
    Serial.println("WEST");
    digitalWrite(ledPins[2],HIGH);
  }
  if (heading > 293 && heading < 338)
  {
    Serial.println("NORTH-WEST");
    digitalWrite(ledPins[1],HIGH);
  }

  delay(500); // update position of LED for every alf seconds 
//Turn off the all the LED 
    for (int thisPin=0; thisPin <= led_count; thisPin++){
     digitalWrite(ledPins[thisPin],LOW);
  }
}

Credits

Liono Maker

Liono Maker

3 projects • 4 followers
I have been making creative electronics project since my childhood and this is my passion to design, to think creative more about technology

Comments