Protect your ride with this advanced acoustic detector! This ESP32-S3 project uses spectral fingerprinting to identify bicycle bells in real-time, specifically designed to alert headphone users of incoming cyclists. By combining 512-point FFT analysis with a custom "sustain check" logic, the system effectively distinguishes metallic resonances from false positives like claps or shouts. Once a match is confirmed, the device sends an instant BLE notification to your smartphone, triggering a voice alert tha