ACTIVITY DETECTION IN MEMS ACCELEROMETERS

摘要

A method of detecting activity with a MEMS accelerometer stores a value of acceleration, then measures acceleration at a later time, calculates a change in acceleration using the measured acceleration and the stored acceleration, and compares the change in acceleration to an activity threshold to detect activity. A method of detecting inactivity uses a similar technique along with a timer. The method of detecting inactivity with a MEMS accelerometer stores an acceleration value, then measures acceleration at a later time, calculates a change in acceleration using the measured acceleration and the stored acceleration, and compares the change in acceleration to an inactivity threshold. If the change in acceleration is less than the inactivity threshold and, if a predetermined period of time has elapsed, then inactivity is detected.