VR IMU (Qwiic) - BNO080 High Precision

SKU: SPX-14618 Brand: Sparkfun

Retired Product

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This product has been retired. It is no longer available, but this page has been kept for reference.

First, let us apologize for the product name; it’s hard to describe everything this sensor can do. The VR IMU uses the impressive BNO080 IMU. This IC has a combination triple axis accelerometer/gyro/magnetometer packaged with an ARM Cortex M0+ running powerful algorithms. The BNO080 Inertial Measurement Unit (IMU) produces accurate rotation vector headings, excellently suited for VR and other heading applications with a static rotation error of 2 degrees or less. It’s what we’ve been waiting for: all the sensor data is combined and drift corrected into meaningful, accurate IMU information.

This IC was designed to be implemented in Android based cellular phones to handle all the computations necessary for virtual reality goggles using only your phone. The sensor is quite powerful and with power comes a complex interface. We’ve written an I²C based library that provides the rotation vector (the reading most folks want from an IMU) as well as acceleration, gyro, and magnetometer readings, step counting, activity classifier (such as riding a bike), and calibration.

The VR IMU uses two Qwiic connectors. Qwiic cables are thin and flexible allowing you to manipulate the IMU in space unimpeded. This is especially handy when moving or calibrating the sensor. We’ve created a demo Processing app to see how the movement of the IMU can accurately manipulate a 3D object using the Quaternion output from the IMU.

There are jumpers on the board allowing the user to select between two different I²C addresses, remove the I²C pull up resistors, and select between the three different interface protocols. If I²C is not your first communication choice the sensor is capable of communicating over SPI and UART as well! If you’re using the UART we recommend the Serial Basic for an easy connection.

This version incorporates an on-board 32kHz crystal for increased precision and more accurate time stamps.

Check the documents section for a link to our Arduino library!

We do not plan to regularly produce SparkX products so get them while they’re hot!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.

Features

Interfaces:

The BNO080 can communicate through a variety of interfaces. The Qwiic VR IMU has two jumpers that allows the user to select their interface of choice.

I2C (Default): Up to 400kHz
SPI: Up to 3MHz
UART: 3Mbps
UART-RVC (Robot Vacuum Cleaners): 115200kbps

Performance Characteristics:

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: 0.35m/s²
Accelerometer Accuracy: 0.3m/s²
Gyroscope Accuracy: 3.1° / sec
Magnetometer Accuracy: 1.4µT

Documents

VR IMU (Qwiic) - BNO080 Schematic
Arduino Library - Available through the library manager. Search for ‘SparkFun BNO080’.
Example Processing Sketch showing how to use quaternions to rotate a cube
BNO080 Datasheet
BNO080 Command Reference Manual
BNO080 Transport Protocol
Calibrating the BNO080
Eagle Files
Github repo with latest hardware files

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