Designing a Spreadsheet-Based Reverse Vending Machine (RVM) Database Using Arduino Mega 2560 and NodeMCU with App Script Integration. jse [Internet]. 2024 Jul. 27 [cited 2026 Jul. 1];9(3):10122-36. Available from: https://jse.serambimekkah.id/index.php/jse/article/view/396