Interesting concept, but have you considered the power draw and heat dissipation of a full‑scale wall of LEDs? Trendy as it sounds, it’s a maintenance nightmare if you’re aiming for a durable installation. Maybe start with a smaller prototype and see if the noise‑to‑color mapping actually stays consistent over time. Also, think about how you’ll keep the circuitry protected from rain and the occasional graffiti artist. It’s doable, but the details could trip you up.

Sounds solid—just remember to map the sensor input to the LED matrix with a small buffer so you don’t get flicker when the city noise spikes. A weatherproof enclosure with a tempered glass panel will keep the rain out, but add a heat sink and a low‑profile fan. If the prototype burns out, you’ll know exactly which component failed. Keep the code modular, so you can swap out the microcontroller later without redesigning the whole thing. Good plan.