Application note
BNO055 – USB stick user guide
Page 5
BST-BNO055-AN009-00 | Revision 1.0 | August 2014
Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to
third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
7.
If you go to Panels and activate 3D Compass a new window opens and displays 3D
object which motion is controlled with the orientation data streamed by BNO.
Please note:
Before you start the 3D Compass, BNO must be set to one of the fusion modes, i.e. :
eCompass (acceler magnetometer)
IMU(acceler gyroscope)
9Dof(acceler gyr magnetometer)
etc.
3.1
Sensor calibration
The BNO should be also calibrated. Calibration status is indicated in the panel right. Un-
calibrated BNO stick will deliver data of lower accuracy. Calibration of magnetometer and
gyroscope is crucial.
Calibration procedure
Gyroscope:
Requites steady state for short moment in order to calibrate itself. For
example, place sensor on a flat surface without movement for a short period of time.
Magnetometer:
The stick must be moved several times in infinity-sign-like-shaped path
(“paint 8’s in the air”).
Accelerometer:
To calibrate the sensor stick must be placed in six different steady
positions. This step can also be confidently omitted, since the offsets of the
accelerometer channels are small and by that have no negative impact on the data
accuracy of the fused data.
4.
Flashing new firmware
4.1
Flashing new BNO055 firmware
Any new BNO055 USB stick firmware will be released together with a new release of
Development Desktop 2.0 version. Please follow the appropriate documentation of
Development Desktop 2.0.
4.2
Flashing new MCU firmware
Please follow the instructions carefully given in the Development Desktop 2.0 help files. The
firmware file is called „BNOinUSBStick.fwu3”;
do not flash anything else other than files
with ending .fwu3!
5.
Miscellaneous
5.1
LED indications
D1 and D2 both glows together three times
MCU is in bootloader mode
D1 alone glows continuously
MCU is power on and is in application mode
