HMC5883L Electronic Compass Module Compass Module Three-Axis Magnetic Sensor Using high-quality immersion gold PCB, machine welding process to ensure quality Name: HMC5883L modules (three-axis magnetic module) Model: GY-271 Use Chip: HMC5883L Power supply :3-5v Communication: IIC communication protocol Measuring range: ¡À 1.3-8 gauss Provide schematics, manuals and reference documents related data Provide 51, AVR microcontroller test code - photographed after payment contact businesses to provide information download address.