Keith presents his new series of sensor bows for stringed
instruments. They provide hair tension, grip
pressure, X-Y-Z acceleration, relative X-Y position wrt to the
bridge and the tilt or twist of the bow.

Even if you are not a bowed instrument player the integration techniques Keith has developed to keep the bow light and energy efficient are interesting for any inertial sensing project.

<img src="http://cnmat.berkeley.edu/system/files/attachments/DSC01331.jpg">