Injury caused by fall events is one of the greatest threats for elderly adults. This article introduces a system of fall detection including a wearable device based on Bluetooth communication, a triaxial accelerometer and a mobile phone connected to the Internet. The wearable device is used to collect the acceleration data of users, while the mobile phone receives the data and judges whether the user is fallen or not. Once the fall event is determined, the phone will send an alert message to the contacts with the fallen elderly's address. The fall detection system is reliable and efficient, as it reaches 98 percent through a great deal of testing.
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