Lifesaving bracelet

Abstract

The invention discloses a lifesaving bracelet. The bracelet comprises a nine axis motion sensor used for the real-time acquisition of the real acceleration and attitude angle at the hands of a swimmer, conducts the data fusion for the real acceleration and attitude angle, the real acceleration is decomposed to the absolute coordinate system and converted into motion acceleration in the absolute coordinate system; a microprocessor MCU is used to calculate the motion acceleration in the absolute coordinate system to obtain the acceleration component of the motion acceleration in the absolute coordinate system in the Z-axis direction; using the acceleration component to calculate the number of times of beating water by the swimmer within a predetermined time, and if the number of times of beating water by the swimmer is greater than the preset threshold within a predetermined time, the swimmer's movement state is judged to be in a drowning state and the alarm signal is transmitted to the remote monitoring terminal; and the power modular connected to the MCU. The lifesaving bracelet improves the accuracy to detect the drowning state as well as the alarm efficiency.

Description

technical field [0001] The invention relates to the technical field of bracelets, in particular to a lifesaving bracelet. Background technique [0002] At present, especially in summer and summer, drowning accidents occur frequently, and news reports show that beaches and shallow seas have become areas with high incidence of drowning accidents. But swimming is of great exercise value. It can not only improve cardiopulmonary function, but also have an excellent exercise effect on the muscles of the whole body. At the same time, water exercise is good for the treatment of chronic diseases and physical recovery of the elderly. This makes swimming a passion for the majority of men, women and children. From this, it can be seen that swimming safety issues in places such as beach swimming pools have become an urgent problem to be solved. [0003] In the prior art, the lifesaving wristband uses the heart rate sensor and air pressure sensor to judge drowning. Since the pulse of t...

AI Technical Summary

Problems solved by technology

However, the current heart rate sensor technology is not mature enough, and it can be used on land. However, experiments have found that when using an optical heart rate sensor underwater, the heart rate deviation is large due to the sensor’s surface being soaked in water. If it is used as a basis for judging whether you are drowning, It will often cause misjudgment and even endanger the life of the drowning person, so the accuracy of the life-saving bracelet for the detection of the drowning state is not high

Moreover, it is theoretically feasible to judge whether you are drowning by the threshold value of the water pressure sensor, but there are still defects: the size of the water pressure sensor is relatively large, and it is difficult to fit into a small wristband; the water pressure drowning judgment algorithm is actually a It is an after-event remedial measure after the heart rate is wrongly judged. It requires the person to drown in the water for a certain period of time before triggering the drowning alarm. At this time, the drowning person may have inhaled a large amount of water into the lungs. problem, so the alarm efficiency of the life-saving bracelet is not high

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