Development Free Fall Motion teaching aid with Metal Detection sensor
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Abstract
This paper presents the development of a low-cost microcontroller based free-fall motion experimental devices. The free full time results was printed on LCD display. The purpose is to improve a free-fall experimental device performance by considering cost reduction, simple to use, high both accuracy and precision results. The control algorithm was implemented in an Arduino Uno R3, which is an inexpensive microcontroller unit (mcu). The height is measured from the lowest point of the metal ball to the strike plate using HC-SR04 ultrasonic sensor. To reduce the impact force on a strike plate, a method for detecting a fallen metal ball using metal detection systems. The experimental result shown that the gravity measured using the Free-Fall prototype is 10.0 m/s2. Compared to the value of g measured at the nearby Udon Thani province by the National Institute of Metrology (Thailand) as 9.784156709, the value from the experiment device differs from the standard value by 2.206 %.
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