Magnetometer BMM150

The BMM150 is a compact, ultra-low-power 3-axis digital magnetometer designed for accurate orientation sensing, electronic compass applications, and inertial navigation. Its versatile I²C and SPI interfaces ensure easy integration with popular platforms such as Arduino, ESP32, and Raspberry Pi.

Magnetometer BMM150

Resource	Link
Github Repository	Github Repository
Product Brief	Product brief
Schematic	Schematic

Key Features

• Axes: 3 (X, Y, Z)
• Measurement Range: ±1300 µT
• Resolution: ~0.3 µT
• Power Consumption: Ultra-low power consumption for battery-operated devices
• Interfaces: I²C and SPI
• Supply Voltage: 3.3 V
• Operating Temperature: Wide operating range suitable for various environments
• Additional Signals:
  • DRDY (Data Ready)
  • INT (Programmable Interrupt)
  • SDO/ADDR (I²C address select / SPI MISO)

Applications

Application	Description
Electronic Compass	Detects Earth’s magnetic field to determine the device orientation.
Inertial Navigation (INS)	Integrates with accelerometers and gyroscopes to improve position and orientation estimation.
Augmented Reality (AR)	Dynamically adjusts AR content on smart devices based on precise orientation data.
Metal Detection / Proximity Sensing	Monitors magnetic field variations to detect metallic objects and machinery anomalies.
Mobile Robotics and Drones	Provides reliable heading information, essential for indoor navigation and autonomous operation.
Wearables and Portable Devices	Enhances personal navigation in smartwatches, fitness trackers, and other portable devices.
Indoor Geolocation	Improves indoor positioning accuracy by compensating for sensor drift and interference.

Example Code

#include <Wire.h>
#include "DFRobot_BMM150.h"

// Crear un nuevo bus I2C en los pines GPIO 6 (SDA) y 7 (SCL)
TwoWire I2CBMM = TwoWire(1);

// Dirección I2C por defecto del BMM150 (depende del cableado de CS y SDO)
DFRobot_BMM150_I2C bmm150(&I2CBMM, I2C_ADDRESS_4);

void setup() {
  Serial.begin(115200);
  delay(1000);

  // Iniciar el nuevo bus I2C
  I2CBMM.begin(6, 7);  // SDA = 6, SCL = 7

  // Iniciar sensor
  while (bmm150.begin()) {
    Serial.println("bmm150 init failed, Please try again!");
    delay(1000);
  }
  Serial.println("bmm150 init success!");

  bmm150.setOperationMode(BMM150_POWERMODE_NORMAL);
  bmm150.setPresetMode(BMM150_PRESETMODE_HIGHACCURACY);
  bmm150.setRate(BMM150_DATA_RATE_10HZ);
  bmm150.setMeasurementXYZ();
}

void loop() {
  sBmm150MagData_t magData = bmm150.getGeomagneticData();
  Serial.print("mag x = "); Serial.print(magData.x); Serial.println(" uT");
  Serial.print("mag y = "); Serial.print(magData.y); Serial.println(" uT");
  Serial.print("mag z = "); Serial.print(magData.z); Serial.println(" uT");

  float compassDegree = bmm150.getCompassDegree();
  Serial.print("Compass angle (deg): ");
  Serial.println(compassDegree);
  Serial.println("------------------------------");

  delay(200);
}