Your First I2S Digital Audio Recorder

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, speak a command, and capture crisp audio directly to a microSD card as a standard WAV file sampled at 44100Hz. This kit turns an ESP32 into a standalone digital voice recorder, complete with an OLED status display and two tactile controls - ideal for IoT sound loggers, mini dictation devices, and embedded audio capture projects. Whether you're building a voice-activated assistant or a portable memo recorder, this project gives you hands-on experience with I2S MEMS microphones, SPI displays, and FAT file handling on the ESP32.

What You'll Build

You'll assemble a fully functional audio recorder on a breadboard. The INMP441 I2S mic captures voice, the ESP32 encodes it to 16-bit PCM WAV at 44100Hz mono, and stores the file on an 8GB microSD via the SPI module. The OLED shows recording status, file name, and sample rate in real time. Two tactile buttons let you start/stop recording and navigate a simple menu. After the build, you'll have a reusable voice capture tool - ready for STEM demos, engineering mini projects, or inspiration for a larger IoT design.

What You'll Learn

• Configure I2S peripheral on ESP32 to sample audio from the INMP441 MEMS microphone
• Write raw PCM data into a standard WAV container with correct header formatting
• Use the SD card library to create, write, and close audio files over SPI
• Drive a 0.96-inch OLED via I2C and update it with dynamic recording parameters

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for intermediate learners who have worked with basic Arduino or ESP32 I/O and are ready to explore digital audio. It fits seamlessly into CBSE Class 11-12 computer science electives, B.Tech ECE/EEE mini projects, Smart India Hackathon prototyping, and ATL Tinkering Labs. Engineering students at IIT, NIT, VIT, or BITS will find the I2S focus especially valuable for embedded systems coursework.

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.