Learn to pronounce This study aims to design a straight-motion experimental device using an Arduino Uno microcontroller to produce accurate data. The method used in this research is the Research and Development (R&D) research method. The model used is the development of a 4-D model. The 4-D (Four D) development model is a development model of learning tools. Based on data analysis, it can be concluded that this study has successfully designed a timer using a microcontroller to be developed as an alternative learning media in accurately calculating the time of a straight moving object.
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