Description
HMC5883L GY-271 3-Axis Compass and Magnetometer Module
Three-axis magnetic-field sensor board intended for compass heading and magnetometer projects. The listing identifies an HMC5883L chip and I²C communication. Some boards sold as GY-271 use a compatible alternative chip; verify the marking and documentation of the board you receive before selecting software or wiring.
Specifications stated in the listing
- Chip: HMC5883L (verify actual board)
- Interface: I²C
- Board operating voltage: 3–5V DC as listed; confirm logic-level compatibility for your specific board
- Measurement range listed: ±1.3 to 8 Gauss
- Dimensions: 14.8 × 13.5 × 3.5mm
The sensor provides digital measurement data over I²C; the source’s description of differential analog voltage as the output is inaccurate. Heading accuracy depends on calibration, tilt compensation, nearby magnetic materials and the fitted chip. Keep the module away from motors, magnets and current-carrying wires while calibrating. Two datasheet links are provided by the source below.
Seller datasheet link
Additional HMC5883L datasheet link
Do not assume a 5V supply also makes I²C logic 5V-safe; check the module schematic and controller levels before connecting.
