The purpose of developing Arduino Uno-based physics learning media to measure density is to determine the level of feasibility based on the assessment of media experts and material experts, as well as to determine student responses to the development of learning media carried out. This study uses the ADDIE model which consists of 5 stages, namely analysis, design, development, implementation, and evaluation. Based on the data analysis, it can be concluded that the validation of the Arduino Uno-based physics learning media by two media experts obtained an average percentage score of 92.08% with very decent criteria and by two material expert validators obtained an average percentage score of 88, 75% with very decent criteria. Student responses to the Arduino Uno microcontroller-based physics learning media obtained an average percentage score of 84.58% with very decent criteria. The implication of this research is that teachers and students can use tools developed digitally and can compare them with manual experiments.