Accelerometer With Compass Magnetometer Sensor GY-273 3V-5V QMC5883l Triple Axis

Features:

• Low noise, high-accuracy 3-axis magnetic field sensing
• I2C digital communication interface (100 kHz / 400 kHz)
• High resolution 16-bit ADC output
• Selectable magnetic sensitivity ±2mG to ±8G
• Integrated data-ready interrupt pin (DRDY)
• Low current consumption (75 µA typical active mode)
• Fast acquisition time: 6 ms
• Compact design with standard 2.54mm pin spacing
• Operating temperature: -30°C to +85°C

Specifications:

Working Principle:

The QMC5883L uses the Anisotropic Magnetoresistance (AMR) effect to detect magnetic fields. When a magnetic field is present, it alters the resistance of a ferrous sensing element inside the chip. This resistance change, due to Lorentz force interaction, is measured and converted into a digital signal via an onboard ADC. This allows the module to sense direction and field strength in all three axes (X, Y, Z).

Pinout:

• VCC: Power supply (3.3V to 5V)
• GND: Ground
• SCL: I2C clock line
• SDA: I2C data line
• DRDY: Data Ready output (optional)

Wiring with Arduino UNO:

• VCC → 5V
• GND → GND
• SCL → A5
• SDA → A4

Sample Arduino Code:

#include <Wire.h>

#define addr 0x1E // I2C address for QMC5883L

void setup() {
  Serial.begin(9600);
  Serial.println("QMC5883L Magnetometer Initialization");
  Wire.begin();

  Wire.beginTransmission(addr);
  Wire.write(0x02); // Mode Register
  Wire.write(0x00); // Continuous measurement mode
  Wire.endTransmission();
}

void loop() {
  int x, y, z;

  // Start reading from register 3
  Wire.beginTransmission(addr);
  Wire.write(0x03);
  Wire.endTransmission();

  // Read 6 bytes of data
  Wire.requestFrom(addr, 6);
  if (Wire.available() >= 6) {
    x = Wire.read() << 8 | Wire.read();
    z = Wire.read() << 8 | Wire.read();
    y = Wire.read() << 8 | Wire.read();

    Serial.print("X: "); Serial.println(x);
    Serial.print("Y: "); Serial.println(y);
    Serial.print("Z: "); Serial.println(z);
    Serial.println();
  }

  delay(1000);
}

Applications:

• Digital compasses
• Robotics navigation
• Orientation tracking in drones
• Magnetic field mapping
• Wearable direction-sensing devices
• Educational sensor experiments