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. 2022 Jan 24;12(2):60.
doi: 10.3390/bios12020060.

A Self-Powered Wearable Motion Sensor for Monitoring Volleyball Skill and Building Big Sports Data

Weijie Liu  1 , Zhihe Long  2 , Guangyou Yang  1 , Lili Xing  1
Affiliations

A Self-Powered Wearable Motion Sensor for Monitoring Volleyball Skill and Building Big Sports Data

Weijie Liu et al. Biosensors (Basel). .

Abstract

A novel self-powered wearable motion sensor for monitoring the spiking gesture of volleyball athletes has been manufactured from piezoelectric PVDF film. The PVDF film can convert body mechanical energy into electricity through the piezoelectric effect, and the flexible device can be conformably attached on the hand or arm. The sensor can work independently without power supply and actively output piezoelectric signals as the sports information. The sensor can detect the tiny and fine motion of spiking movement in playing volleyball, reflecting the skill. Additionally, the sensor can also real-time monitor the pulse changes and language during a volleyball match. The self-powered sensors can link to a wireless transmitter for uploading the sports information and building big sports data. This work can provoke a new direction for real-time sports monitoring and promote the development of big sports data.

Keywords: big sports data; motion monitoring; self-powered; wearable electronics.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental design of self-powered wearable motion sensor for monitoring volleyball skill and building big sports data. (a) The wearable sensor for building big sports data; (b) the optical image of sensor; (c) The fabrication processes of the self-powered sensor; (d) The working mechanism of the piezoelectric sensor. (e) The top-view SEM image of PVDF film; (f) The side-view SEM image of PVDF film; (g) The side-view SEM image of PVDF film encapsulated by PDMS.
Figure 2
Figure 2
The performance of the self-powered wearable sensor. (a) The schematic diagram of the bending sensor with stepper motor; (b) The output piezoelectric voltage at different bending frequencies; (c) Details of output piezoelectric voltage at different frequencies; (d) The output piezoelectric voltage at different bending angles; (e) The output piezoelectric voltage response at different frequencies; (f) The output piezoelectric voltage response at different angles; (g) The durability test of sensor.
Figure 3
Figure 3
Multiple functions of the sensor. (a) Circuit diagram of the charging system for the sensor; (b) The charging capability of the sensor under different capacitance capacities; (c) The relationship between charging the voltage and charging time of sensor; (d) An optical image of the sensor while monitoring pulse; (e) The output piezoelectric voltage under volunteer’s different states; (f) The sensor for voice recognition; (g) The output piezoelectric voltage when the volunteer speaks different words.
Figure 4
Figure 4
Practical application of the sensor. (a) A schematic diagram of spiking technology; (b)The optical image of the sensor attached on the finger; (c) An optical image of the sensor attached on the elbow; (d) A schematic diagram of different bending angles of palm during test; (e–g) The output piezoelectric voltage of three subjects when finger bending angle changes; (h) A schematic diagram of different bending angles of the elbow during testing; (i–k) The output piezoelectric voltage of three subjects when elbow bending angle changes.
Figure 5
Figure 5
Simple wireless system integrated with the sensor. (a) The wireless system when wrist is straight; (b) The wireless system when wrist is bent.
See this image and copyright information in PMC

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