DFRobot Fermion BMM150 Triple Axis Magnetometer Sensor Breakout - I2C/SPI Interface

The sensor requires a 3.3V DC power supply. It is not 5V tolerant. For use with 5V microcontrollers like most Arduino boards, you must use a logic level converter on the I2C or SPI data lines to avoid damaging the sensor.

The breakout supports both I2C and SPI digital communication protocols. The default interface is I2C with a selectable address. You can switch to SPI mode by configuring the appropriate chip select (CS) pin. Libraries from DFRobot or Bosch Sensortec provide easy integration with Arduino, Raspberry Pi, and other platforms.

The programmable interrupt allows the sensor to wake up a host microcontroller only when specific magnetic field thresholds are crossed or when new data is ready. This feature is crucial for minimizing system power consumption in battery-operated devices like wearables or portable navigation units.

Yes, the BMM150 is specifically designed for compass applications. It provides high-resolution magnetic field data on all three axes. To calculate heading, the raw magnetic readings must be processed (often using a tilt-compensation algorithm) with data from an accelerometer to account for the device's orientation relative to the Earth's magnetic field.