ESP32 I2S Audio Recorder Kit — Capture Studio-Quality WAV Audio Directly to SD Card

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

Press a button and the INMP441 I2S microphone captures voice, ambient sound, or musical instruments, converting them into CD-quality WAV files at 44100 Hz sample rate. A crisp OLED displays recording status and filename, while the MicroSD card gives you portable, reusable storage. This isn’t a toy — it’s a real audio capture system that teaches you how professional digital recorders work, from I2S timing to FAT filesystem operations.

What You'll Build

You’ll assemble a standalone audio recorder on a breadboard: a tap on one tactile button starts recording, another tap stops and finalizes the WAV header. The 0.96-inch OLED shows “REC” in real time and appends incrementing file names like REC_001.WAV. You’ll then pop out the 8 GB MicroSD, plug it into any laptop, and play back your recordings with no additional drivers. This is your own field recorder, voice memo gadget, or sound sample logger — a complete embedded system that’s ready to demo at school science exhibitions or hackathons.

What You'll Learn

• Configure the ESP32 I2S peripheral to read 24-bit audio samples from the INMP441 microphone at exactly 44.1 kHz.
• Structure a WAV file header (RIFF chunk, fmt sub-chunk, data sub-chunk) and stream raw audio to a MicroSD card via SPI.
• Display real-time status and file names on a 0.96-inch OLED using I²C, and manage button debouncing with hardware interrupts.
• Debug I2S clock lines, pull-up resistor values, and SD card initialisation — skills that transfer to any embedded audio project.

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11–12 students building a physics investigatory project on digital sound recording or signal processing will find the WAV implementation directly applicable. B.Tech ECE and EEE undergraduates can use this as an I2S lab exercise or a starting point for a Smart India Hackathon prototype. ATL Tinkering Lab mentors appreciate that every connection is documented, and the 15–18 age range hits the sweet spot where learners have basic Arduino familiarity and are ready for an intermediate challenge.

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.