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Compass 3-Axis BMM150 Magnetometer Sensor Module (WaveShare)
The BMM150 magnetometer sensor offers precise 3-axis measurements with an ultra-compact design, low power consumption, and minimal noise interference. Ideal for altitude tracking, IoT projects, wearables, drones, and GPS modules, it supports both I2C and SPI interfaces and 3.3V/5V voltage levels.
Package Includes:
- 1 x BMM150 3-Axis Magnetometer Sensor Module
- 1 x PH2.0 5PIN cable
Features:
- Compact Form Factor: Ultra-small design for easy integration in space-constrained projects.
- Energy Efficiency: Low power consumption for prolonged operational hours.
- Precision and Reliability: Ultra-low noise guarantees accurate altitude measurements.
- Versatile Connectivity: Supports both I2C and SPI interfaces.
- Voltage Adaptability: Compatible with 3.3V and 5V systems.
Principle of Work
Internal Operation:
- Magnetometer Sensor Elements: Three sensor elements measure the magnetic field along X, Y, and Z axes using the Hall effect.
- Magnetic Field Measurement: Continuously measures strength and direction along all axes.
- Analog to Digital Conversion: Converts analog Hall effect signals into digital data.
- Data Processing: Calculates net magnetic field vector with error and temperature compensation.
- Output: Digital data available via I2C or SPI interfaces.
Interaction with MCU:
- Initialization: MCU sends setup commands via I2C or SPI.
- Data Retrieval: MCU reads magnetic field data along X, Y, Z axes.
- Data Processing: MCU calibrates and converts raw data, optionally fusing with accelerometer/gyroscope data.
- Algorithm Integration: Determine orientation or heading relative to Earth's magnetic field.
- Application-Specific Functions: Digital compass, drone navigation, augmented reality heading info, etc.
Module Pinout:
| Pin | Description | Additional Information |
|---|---|---|
| VCC | Power input | Provides voltage to the sensor. |
| GND | Ground | Electrical ground reference. |
| SDA | I2C Data | I2C data line. |
| SCL | I2C Clock | I2C clock line. |
| INT | Interrupt Output | Connect to I/O pin for event signaling. |
| SDO | SPI Data Out (MISO) | Data from sensor to host. |
| SDI | SPI Data In (MOSI) | Data from host to sensor. |
| CS | Chip Selection | Enable/disable sensor communication. |
| DRY | Data Ready | Signals when sensor is ready to send/receive data. |
Applications:
- Wearables: Altitude monitoring for fitness and outdoor tracking.
- Audible Devices: Elevation-based navigation or audio applications.
- Drones: Precise altitude measurements for stable flight.
- Altimeters: Accurate altitude readings for any device.
- Environmental Monitoring: Real-time data for research and studies.
- IoT Projects: Enhances IoT applications with critical altitude data.
Circuit Connection:
| Module Pin | Arduino Uno Pin | Description |
|---|---|---|
| VCC | 5V | Power input connection. |
| GND | GND | Ground connection. |
| SDA | SDA | I2C data line. |
| SCL | SCL | I2C clock line. |
| INT | NC | No connection; optional interrupt usage. |
Library & Code:
Download the example demo and copy the Arduino folder into your code directory. The included sketch initializes the BMM150, reads magnetic data along X, Y, Z axes, and prints results to the serial monitor.
Technical Details:
- Operating voltage: 3.3V / 5V
- Communication interface: I2C / SPI
- Resolution: 0.3 μT
- Linearity: <1% FS
- Gain error: ±2%
- Temperature drift: ±0.01% / K
- Zero point drift: ±40 μT (25°C)
- Measuring range: ±1300 μT (X,Y), ±2500 μT (Z)
- Data output rate: 10 Hz (normal mode)
- Operating temperature: -40~85°C
- Dimensions: 29mm × 20mm
Comparisons:
| Aspect | BMM150 | BME280 |
|---|---|---|
| Type | 3-Axis Magnetometer | Environmental Sensor (3-in-1) |
| Functionality | Measures magnetic fields in 3D | Measures temperature, humidity, pressure |
| Use Cases | Compasses, orientation sensing | Weather monitoring, indoor climate control, IoT |
| Key Features | 3-axis sensing, ultra-small, low power, low noise, I2C/SPI, 3.3V/5V | 3-in-1 sensor, high accuracy, low power, I2C/SPI, 3.3V/5V |
Features:
- Compact Form Factor: Ultra-small design for easy integration in space-constrained projects.
- Energy Efficiency: Low power consumption for prolonged operational hours.
- Precision and Reliability: Ultra-low noise guarantees accurate altitude measurements.
- Versatile Connectivity: Supports both I2C and SPI interfaces.
- Voltage Adaptability: Compatible with 3.3V and 5V systems.
Principle of Work
Internal Operation:
- Magnetometer Sensor Elements: Three sensor elements measure the magnetic field along X, Y, and Z axes using the Hall effect.
- Magnetic Field Measurement: Continuously measures strength and direction along all axes.
- Analog to Digital Conversion: Converts analog Hall effect signals into digital data.
- Data Processing: Calculates net magnetic field vector with error and temperature compensation.
- Output: Digital data available via I2C or SPI interfaces.
Interaction with MCU:
- Initialization: MCU sends setup commands via I2C or SPI.
- Data Retrieval: MCU reads magnetic field data along X, Y, Z axes.
- Data Processing: MCU calibrates and converts raw data, optionally fusing with accelerometer/gyroscope data.
- Algorithm Integration: Determine orientation or heading relative to Earth's magnetic field.
- Application-Specific Functions: Digital compass, drone navigation, augmented reality heading info, etc.
Module Pinout:
| Pin | Description | Additional Information |
|---|---|---|
| VCC | Power input | Provides voltage to the sensor. |
| GND | Ground | Electrical ground reference. |
| SDA | I2C Data | I2C data line. |
| SCL | I2C Clock | I2C clock line. |
| INT | Interrupt Output | Connect to I/O pin for event signaling. |
| SDO | SPI Data Out (MISO) | Data from sensor to host. |
| SDI | SPI Data In (MOSI) | Data from host to sensor. |
| CS | Chip Selection | Enable/disable sensor communication. |
| DRY | Data Ready | Signals when sensor is ready to send/receive data. |
Applications:
- Wearables: Altitude monitoring for fitness and outdoor tracking.
- Audible Devices: Elevation-based navigation or audio applications.
- Drones: Precise altitude measurements for stable flight.
- Altimeters: Accurate altitude readings for any device.
- Environmental Monitoring: Real-time data for research and studies.
- IoT Projects: Enhances IoT applications with critical altitude data.
Circuit Connection:
| Module Pin | Arduino Uno Pin | Description |
|---|---|---|
| VCC | 5V | Power input connection. |
| GND | GND | Ground connection. |
| SDA | SDA | I2C data line. |
| SCL | SCL | I2C clock line. |
| INT | NC | No connection; optional interrupt usage. |
Library & Code:
Download the example demo and copy the Arduino folder into your code directory. The included sketch initializes the BMM150, reads magnetic data along X, Y, Z axes, and prints results to the serial monitor.
Technical Details:
- Operating voltage: 3.3V / 5V
- Communication interface: I2C / SPI
- Resolution: 0.3 μT
- Linearity: <1% FS
- Gain error: ±2%
- Temperature drift: ±0.01% / K
- Zero point drift: ±40 μT (25°C)
- Measuring range: ±1300 μT (X,Y), ±2500 μT (Z)
- Data output rate: 10 Hz (normal mode)
- Operating temperature: -40~85°C
- Dimensions: 29mm × 20mm
Comparisons:
| Aspect | BMM150 | BME280 |
|---|---|---|
| Type | 3-Axis Magnetometer | Environmental Sensor (3-in-1) |
| Functionality | Measures magnetic fields in 3D | Measures temperature, humidity, pressure |
| Use Cases | Compasses, orientation sensing | Weather monitoring, indoor climate control, IoT |
| Key Features | 3-axis sensing, ultra-small, low power, low noise, I2C/SPI, 3.3V/5V | 3-in-1 sensor, high accuracy, low power, I2C/SPI, 3.3V/5V |