We’ve all been there: you find the perfect spot in the library, ready to dive into your studies, only to be disrupted by a loud conversation nearby. Libraries are sanctuaries of silence, but maintaining that atmosphere is a constant challenge. Staff can't be everywhere, and often, people don't even realize they're being disruptive. This project was born from a simple idea: what if technology could provide a gentle, automated nudge to maintain a peaceful environment? I designed a smart, non-intrusive noise monitoring system that: Measures ambient noise in real-time. Provides immediate, visual feedback using a color-coded LED ring. Alerts library staff automatically via MQTT when noise exceeds a set threshold. Reports data to a live web dashboard for centralized monitoring.