High-Precision 9-Axis IMU Sensor for AR VR Applications with AHRS Technology

The VR IMU uses the BNO080 IMU. The IC features a three-axis accelerometer, gyroscope, and magnetometer combination that runs alongside an ARM Cortex M0and to execute advanced motion algorithms. The BNO080 Inertial Measurement Unit (IMU) generates accurate rotation vector outputs, suitable for VR and heading applications, with a static rotation error of 2 degrees or less. The IC is designed for integration into Android-based devices to handle motion calculations required for virtual reality applications using a smartphone. An I2C-based library is provided, delivering rotation vectors, acceleration, gyroscope, and magnetometer readings, step counts, activity classification (e.g., cycling), and calibration support. A demo application is included to demonstrate how IMU motion data—specifically quaternion output—can be used to manipulate 3D objects. This version includes onboard 32 kHz crystals for improved timing accuracy and more precise timestamping. Interfaces: The BNO080 supports multiple communication interfaces. The Qwiic VR IMU includes two jumpers to select the desired interface: - I2C (default): up to 400 kHz - SPI: up to 3 MHz - UART: up to 3 Mbps - UART-RVC (for robot vacuum cleaners): 115200 bps Performance specifications: Rotation Vector: - Dynamic Error: 3.5° - Static Error: 2.0° Gaming Rotation Vector: - Dynamic Error: 2.5° - Static Error: 1.5° - Heading Drift: 0.5°/min Geomagnetic Rotation Vector: - Dynamic Rotation Error: 4.5° - Static Rotation Error: 3.0° - Gravity Angle Error: 1.5° - Linear Acceleration Accuracy: 0.35 m/s² - Accelerometer Accuracy: 0.3 m/s² - Gyroscope Accuracy: 3.1°/sec - Magnetometer Accuracy: 1.4 μT Color: As shown Material: Not specified