Voice Command Recorder Kit with ESP32 + LED
Record, Classify, and Visualize Voice Commands with Your Own ESP32 Edge ML Device
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
This kit transforms an ESP32 into a standalone voice command recorder that captures 3-second audio clips, extracts spectral features, and classifies the command genre in real time—no cloud connection needed. You'll build a device that reacts with a colorful LED ring and OLED display, perfect for experimenting with on-device machine learning, building interactive audio installations, or adding smarts to a personal voice assistant.
What You'll Build
A compact, self-contained audio classifier that listens for voice commands, runs a TinyML model locally on the ESP32, and shows the detected genre on a 0.96-inch OLED. A 12-LED WS2812B ring pulses with a distinct animation for each genre you teach it. Logs of every inference are saved to the included 8 GB microSD card for later analysis. Everything is housed in a custom enclosure you assemble.
What You'll Learn
- Capturing high-quality I2S audio from an INMP441 MEMS microphone and streaming it to an ESP32
- Extracting Mel-frequency cepstral coefficients (MFCCs) on a microcontroller to build spectral fingerprints
- Deploying a pre-trained TensorFlow Lite model for audio classification without an internet connection
- Programming WS2812B LED rings with FastLED to create genre-specific light animations
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| INMP441 I2S Mic | 1 |
| MicroSD Module | 1 |
| MicroSD Card 8GB | 1 |
| 0.96in OLED | 1 |
| WS2812B 12-LED Ring | 1 |
| 470Ω Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 5V 2A PSU | 1 |
| Enclosure Box | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This advanced kit is designed for B.Tech ECE/EEE students working on final-year audio ML projects, Smart India Hackathon teams needing a reproducible edge AI demo, and IoT professionals upskilling in TinyML. If you’ve already built basic Arduino circuits and are ready to tackle real-time DSP and on-device machine learning, this project will push your skills forward.
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.
What if I get stuck during the build?
Open the QR code on the box to start a chat with the AI companion, which knows every connection, pinout, and common bug in this kit. You can also send a photo via WhatsApp and get a human reply within hours.
What genre classes does the pre-trained model recognise?
The shipped model distinguishes between four broad voice-command genres: music-request, device-control, query, and idle. You can retrain it with your own 3-second samples using the provided Colab notebook.
Can I power the device from a battery?
Yes, the ESP32 accepts 5V via USB or the barrel jack from the included PSU. A 2‑cell Li‑ion pack with a boost converter can also work; just mind the current drawn by the LED ring at full brightness.
Is soldering required, and what skill level of soldering is needed?
Yes, you will solder the I2S microphone, OLED display, LED ring, and support components onto the prototype boards. The kit includes a soldering iron and solder wire. The build guide and AI companion assume you have basic soldering experience—joints are straightforward through‑hole connections.
Voice — ESP32 samples 3-second audio clips. Edge ML model classifies genre from spectral features without cloud.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items