Goals for Accelerometer Specifications Through experiments we intend to determine: Required bandwidth to detect meaningful accelerations Range of accelerations generated from impact and foot slip Required accelerometer sensitivity

Accelerometer Measurements Analog outputs of accelerometer were used Bandwidth was set to 500 Hz Sampled at 2500 Hz using LabView Output in following plots is about 1V/g, but the resolution is only about 0.02V Accelerometer placed such that the X-axis was tangential to surface, Y-axis was normal to it.

Lifting up and putting down foot perpendicularly to a wooden table

Foot was moved in a circular motion, such that the liftoff angle was very shallow, and it slipped along the surface before lifting off.

The following pictures illustrate the signals that occur when the foot is grasped firmly and dragged along a surface, which causes slipping