The watch is first strapped to the user’s chest (Figure 5),
and the 3-axis accelerometer generates real-time data about
body position. During the first day, the data generated is
continuously collected and stored, and used for calibration and
a threshold value for fall detection is determined. There is a
danger that normal activities (ADL) can be mistakenly
identified as falling, because of similar patterns of activities.
Therefore, it is very important that all possible actions,
including dancing walking and waking up, are identified in the
calibration period. At the end of this period, the watch is ready
for using as an individualized device for fall detection.