GY-273 HMC5883P chip 3 Axis Module Magnetic Field Sensor

Description

The GY-273 HMC5883P 3-Axis Magnetometer Compass Module is a compact, high-sensitivity magnetic field sensor designed for digital compass, orientation detection, and navigation applications. Built around the HMC5883P chip, this module is a modernized successor to the widely used HMC5883L, offering improved availability and performance for demanding projects.

At the heart of the module is the HMC5883P, a 3-axis magnetoresistive sensor with 12-bit ADC resolution that measures magnetic fields across the X, Y, and Z axes. The sensor utilizes Honeywell’s Anisotropic Magnetoresistive (AMR) technology, which provides advantages over other magnetic sensor technologies, including precision in-axis sensitivity and low cross-axis sensitivity. With a measurement range of ±1.3 to ±8 Gauss, it is designed to measure both the direction and magnitude of Earth’s magnetic field, from milli-gauss to 8 gauss.

The module includes onboard voltage regulation and level shifting, allowing it to operate from 3V to 5V supplies — making it directly compatible with both 3.3V and 5V microcontrollers like Arduino Uno, ESP32, and STM32. The I2C interface operates at up to 400 kHz and the module includes 4.7kΩ pull-up resistors for reliable communication.

The GY-273 module breaks out the HMC5883P chip onto a compact PCB measuring approximately 18 × 13 mm, with a standard 2.54mm pin header for breadboard and jumper wire connections. The pinout includes VCC, GND, SCL, SDA, and DRDY (data-ready interrupt, optional).

Important Note: The HMC5883P uses a different I2C address than the older HMC5883L. The HMC5883L uses address 0x1E, while the HMC5883P typically uses a different address. Always verify the correct address for your specific module revision. Libraries may require adjustment for the HMC5883P variant.

Whether you are building a digital compass, a robot with navigation capabilities, a drone flight controller, or a handheld GPS logger, the GY-273 HMC5883P provides a reliable, cost-effective foundation for magnetic sensing. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.

Features

• HMC5883P 3-axis magnetometer — High-resolution magnetic field sensing in X, Y, and Z axes

• 12-bit ADC resolution — Enables 1° to 2° compass heading accuracy

• AMR technology — Anisotropic Magnetoresistive sensors provide precision in-axis sensitivity

• Wide measurement range — ±1.3 to ±8 Gauss

• I2C digital interface — Simple connection with only two data lines, up to 400 kHz

• Wide supply voltage — 3V to 5V operation with onboard regulation and level shifting

• Data-ready (DRDY) pin — Optional interrupt for efficient data reading

• Compact module form factor — Approx. 18 × 13 mm with standard pin header

• Onboard pull-up resistors — 4.7kΩ for reliable I2C communication

• Wide library support — Compatible with HMC5883L Arduino libraries

Technical Specifications