| 摘要 |
A lifeguard alarm system for swimmers, capable of detecting whether a swimmer is moving forward or drowning. The system includes a detecting device, an accelerometer disposed on the detecting device and a computing unit; the accelerometer configured to output respective acceleration values along X, Y, and Z axes of the detecting device and of gravity, the computing unit configured to calculate a sum of squares of the X, Y and Z acceleration values of the accelerometer as a first value and square of an acceleration of gravity as a second value and to compare the first value with the second value. A relationship between the first value and the second value can be used to control the warming unit. |
| 主权项 |
1. A lifeguard alarm system for swimmers, capable of detecting whether a swimmer is moving forward or drowning, the system comprising:
a detecting device, an accelerometer disposed on the detecting device and a computing unit; the accelerometer configured to output respective acceleration values along X, Y, and Z axes of the detecting device and of gravity, the computing unit configured to calculate a sum of squares of the X, Y and Z acceleration values of the accelerometer as a first value and square of an acceleration of gravity as a second value and to compare the first value with the second value; wherein the detecting device further has a warning unit for generating a warning light, sound or electronic signal; wherein the first value changes in response to a movement of the swimmer when the swimmer moves; wherein when the first value is 118% more than the second value or is 95% less than the second value for a period of phenomenon, the swimmer is drowning or struggles and moves upward and downward in water, and the warning unit generates the warning light, the sound or the electronic signal. |
