Wearable Wireless system with embedded real-time fall detection logic for elderly assisted living applications

In recent years, the old people´s accidental falling down has become a serious problem, which caused thousands of death of elderly each year. In this article, we designed a falling down detection system to enhance the security of the elderly. It is a Wireless sensor system which contains a wearable terminal and a coordinator, both of which communicate with ZigBee protocol. The wearable terminal detects people´s instantaneous acceleration and transmits the signal to coordinator and PC for further process. To determine whether the falling action happens, we designed a fall detection algorithm by exploring the 3D-acceleration difference between falling down and ADL (activies of daily living, such as walk, sit down). So the system could judge the fall action in high rate of accuracy.