GY-271 QMC5883L 3-Axis Digital Compass Module I2C Arduino STM32

$6.44 USD

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GY-271 QMC5883L 3-Axis Digital Magnetic Compass Module - I2C, Arduino / STM32

The GY-271 module features the QMC5883L 3-axis magnetometer from QST Corporation, providing digital compass heading via I2C interface. With a 2mG resolution, 200Hz output data rate, and 3.3V-5V supply compatibility, it is the standard compass module for drone flight controllers, robot navigation, and orientation sensing projects.

Key Specifications

Parameter	Value
Sensor IC	QMC5883L (QST Corporation)
Interface	I2C (address 0x0D)
Supply Voltage	3.3V - 5V DC
Measurement Range	+/-8 Gauss (full scale)
Resolution	2mG (milli-Gauss)
Output Data Rate (ODR)	10Hz / 50Hz / 100Hz / 200Hz
ADC Resolution	16-bit per axis
Operating Temperature	-40C to +85C
Module Size	~13 x 13mm

QMC5883L vs HMC5883L

Feature	QMC5883L (GY-271 new)	HMC5883L (GY-271 old)
I2C Address	0x0D	0x1E
Max ODR	200Hz	75Hz
Full Scale Range	+/-8G	+/-8.1G
Library	QMC5883LCompass	HMC5883L / Adafruit

Why Choose GY-271 QMC5883L?

200Hz ODR - Fast update rate for dynamic heading in drones and fast-moving robots
16-Bit Resolution - 2mG resolution for accurate heading calculation
I2C Interface - Simple 2-wire connection to any MCU
3.3V/5V Compatible - Onboard level shifter for both supply voltages
Compact Module - 13x13mm fits in tight spaces

Typical Applications

Drone and UAV compass heading (ArduPilot, Betaflight)
Robot navigation and heading correction
Electronic compass for hiking and outdoor devices
IMU complement (combined with MPU-6050 for 9-DOF)
Metal detection and magnetic anomaly sensing
Autonomous vehicle heading reference

Arduino Library and Setup

Install QMC5883LCompass library by MPrograms. Connect SDA to A4, SCL to A5, VCC to 3.3V/5V, GND to GND.

compass.init(); compass.read(); int heading = compass.getAzimuth();

Calibrate by rotating the module in all directions to compensate for hard-iron distortion.

FAQ

Q: My GY-271 is not detected at I2C address 0x1E - why? Newer GY-271 modules use QMC5883L (address 0x0D), not HMC5883L (0x1E). Use the QMC5883LCompass library and address 0x0D.

Q: How do I get accurate heading from QMC5883L? Perform hard-iron calibration by rotating the sensor through all orientations and recording min/max values for each axis. Apply offset correction in software.