Hi,
Thanks for your inquiry.
The accelerometer inside BNO055 supports total 3 interrupts: Any-motion (slope), Slow/No-notion and High-g. If you want to detect if someone hits your instrument, then Any-motion interrupt is sufficient. You can put BNO055 in CONFIG mode and then configure accel any-motion interrupt parameters such as threshold, duration, enabling interrupt and mapping the interrupt signal to INT pin. Then you can put BNO055 to work in NDOF sensor fusion mode. If hit motion is detected, you should see a pulse on the INT pin.
When BNO055 NDOF sensor fusion is running, the accel is fixed at +/-4g full scale range and 100Hz ODR (output data rate). If the above any-motion doesn't work for you, then you can add another standalone accel BMA400 to your design.
Thanks.
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