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Gravity: BMI323+BMM350 9DOF IMU Sensor (I2C / UART, Plug & Play)
Gravity: BMI323 + BMM350 9 DOF IMU Sensor combines a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer in one compact motion sensing module. Built around Bosch BMI323 and BMM350, it provides acceleration, angular velocity, and magnetic field data for heading-aware motion sensing, electronic compass prototypes, wearable devices, robotics experiments, and embedded orientation projects.
Compared with a basic 6-axis IMU, this 9 DOF module adds magnetometer data for direction-related sensing and 9-axis attitude evaluation. Gravity wiring, I2C/UART communication, selectable I2C addresses, programmable interrupt pins, and GUI visualization help reduce early-stage bring-up and debugging work.
User Manual / Datasheet / Example Codes Etc.
Features
- 9 DOF Motion Sensing: Integrates a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer for acceleration, angular velocity, and magnetic field measurement.
- BMI323 + BMM350 Sensor Combination: Uses Bosch BMI323 for 6-axis inertial sensing and BMM350 for 3-axis magnetic field sensing, enabling heading-aware motion data evaluation.
- Built-In Motion Event Detection: Supports step counting, tap detection, tilt detection, free-fall detection, and activity recognition, reducing the need to build every basic motion event from raw sensor data.
- I2C/UART for Flexible Development: Supports both I2C and UART communication for Arduino, ESP32, Raspberry Pi, and other embedded platforms.
- 4 Selectable I2C Addresses: Supports 0x4A, 0x4B, 0x4C, and 0x4D to reduce conflicts in multi-sensor I2C systems.
- 3 Programmable Interrupt Pins: Allows motion events or sensor conditions to trigger host-side responses without continuous polling.
Applications
- Electronic Compass and Heading Reference
- Robotics Orientation Feedback
- Wearable Motion Devices
- Gesture-Controlled Handheld Devices
Specifications
- Basic Parameters
- Operating Voltage: DC 3.3–5 V
- Operating Current: 3.42 mA
- Communication Interface: I²C / UART
- Connector Type: PH2.0-4P (Gravity pinout) / 2.54 mm pin header holes
- I²C Addresses: 0x4A (default) / 0x4B / 0x4C / 0x4D
- Programmable Interrupt Pins: ×3
Accelerometer Parameters
- Measurement Ranges: ±2 g, ±4 g, ±8 g, ±16 g
- ADC Resolution: 16-bit
- Sensitivity
- ±2 g range: 16384 LSB/g
- ±4 g range: 8192 LSB/g
- ±8 g range: 4096 LSB/g
- ±16 g range: 2048 LSB/g
- Sensitivity Error: ±0.5%
- Zero-g Offset: ±50 mg
- Output Data Rate (ODR)
- High Performance / Normal mode: 12.5 Hz ~ 6400 Hz
- Low Power mode: 0.78125 Hz ~ 400 Hz
- Physical Dimensions
- PCB Size: 32 mm × 27 mm
- Mounting Hole Spacing: 20 mm
- Mounting Hole Diameter: 3 mm
Package Includes
- Gravity: High Precision 9 DOF IMU Sensor ×1
- Gravity 4P Sensor Cable ×1
- 2.54 mm Black Single Row Pin Header – 10-Pin ×1
