ESP32-S3 FFT Audio Spectrum Kit – See Sound in 16 Bands on OLED

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Turn ambient sound into a live, 16-band frequency visualization running at a fluid 30 frames per second. With this kit, you capture audio through an INMP441 MEMS microphone over I2S, offload a 512-point Fast Fourier Transform to the ESP32-S3’s vector processing unit, and plot the resulting spectrum on a sharp 0.96‑inch OLED. Whether you want to understand the physics of sound, prototype a music-responsive display, or sharpen embedded DSP skills, this project shows you exactly how modern microcontrollers handle real-time audio.

What You'll Build

A self-contained audio spectrum analyzer that picks up speech, music, or environmental noise, computes frequency magnitudes from 0 Hz to Nyquist, and renders them as 16 dynamic bars on the OLED. After the 3‑4 hour build, you can hold the device up to a speaker or talk into it and watch the bands dance in real time — no PC required.

What You'll Learn

• Configure the INMP441 I2S microphone to stream high‑quality audio data into the ESP32‑S3
• Leverage the ESP32‑S3’s hardware vector extensions to accelerate a 512‑point FFT
• Map FFT bins to 16 perceptually spaced frequency bands and drive a 0.96‑inch OLED display at 30 fps
• Debug real‑time signal processing code and understand trade‑offs between resolution, latency, and CPU load

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for intermediate makers who have completed a basic ESP32 course and want to explore digital signal processing. Specifically suits B.Tech ECE/EEE students tackling embedded DSP labs, CBSE Class 12 physics students building a practical demonstration of sound frequency analysis, and participants in Smart India Hackathon or ATL Tinkering Lab challenges involving real‑time sensor fusion. If you want to move beyond blinking LEDs and into real‑time computing on a microcontroller, this kit gives you the complete hardware and guided firmware.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.