Kaewjumras, Yongyut

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Kaewjumras, Yongyut
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yongyut.ka@kmitl.ac.th

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    Item type:Publication,
    Estimation of Vertical Jump Height using Capacitive Sensing Method
    (2023-01-01)
    Kaewjumras, Yongyut
    ;
    Klongratog, Bhanupol
    ;
    Inboonma, Weerayut
    ;
    Sukprasertchai, Siwakorn
    ;
    Somdock, Nuttakrit
    This paper presents a low-cost vertical jump height measuring device based on the time-of-flight technique. A capacitive mat was developed and used as a sensing element to sense the athlete's feet. The capacitive mat was made from aluminum foils that dimensions of the capacitive mat ware with a width of 50.3 cm x length of 70.6 cm. The signal conditioning circuitry that was used as an analog front-end for measuring the capacitive was also described. The time difference between when athletes jumped off and reached the ground was calculated by a microcontroller. The jump height was recorded and stored via the computer. A total of 27 athletes, weighted between 48 kg to 115 kg were used as a sample. The testing results have shown that the proposed system has a percentage difference of 18.16%.
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    Item type:Publication,
    Application of Multi-Dimensional Hall Sensor for Gauss Measurement
    (2017-01-01)
    Kaewjumras, Yongyut
    ;
    Mano, Athirot
    ;
    Titiroongruang, Wisut
    This paper reported on a two-dimensional Hall sensor enabling to measure the two spatial components of the magnetic field and applied for gauss measurement application. The device was operated through only five contacts and tested by varying the magnetic flux density from -5000 to 5000 Gauss (G) and using signal conditioning circuitry for amplifying and adjusting the both similar sensitivity. After that, the output signals were converted to digital signals by ADC for transmitting a computer using LAB-VIEW programming and comparison with the standard gauss meter (F.W.Bell5170). The result of gauss measuring application comparison with the standard gauss meter has done with a precision of 0.04-3.80% including a calibration process.