Rifki MS, Farma F, Komaini A, Sepdanius E, Alimuddin, Ayubi N. Development of Sit Up Measuring Tools Based on Arduino and Ultrasonic Sensors With Android Applications. Int. J. Interact. Mob. Technol. [Internet]. 2022 Apr. 26 [cited 2024 Aug. 17];16(08):182-9. Available from: https://online-journals.org/index.php/i-jim/article/view/30673