My existing Arduino sketch has grown into one long file packed with sensor-handling, communication, and general utility routines. The logic works perfectly, so I do not want a single algorithm or architectural decision changed. What I do need is a clean separation of concerns: each coherent group of functions moved into its own header/source pair so the code base becomes far easier to read and follow. Here is what I expect from you: • Analyse the current sketch, spot the natural modules, and decide which blocks belong together. • Create .h/.cpp files for those modules (sensor handling, communication, utilities, or any additional group you identify) and pull the relevant functions into them. • Maintain identical behaviour and compile-time compatibility with the original project; I will flash the new build to the same board to confirm. • Add concise comments explaining the new file structure so future contributors understand where everything lives. Please keep function signatures and internal algorithms intact—only the physical placement of code should change. If you see any naming collisions or include-guard issues while refactoring, resolve them gracefully without altering runtime behaviour. Once complete, send back: 1. The reorganised source tree. 2. A brief README describing the new layout and how to compile/upload exactly as before. If that sounds straightforward, let’s get started—I’m mainly after improved code readability, not a redesign.