Voice Command Recorder Kit with ESP32 + Relay
Voice Command Recorder Kit – ESP32 Offline AI Relay Control
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine controlling your room’s lights, fans, or any appliance with just a spoken word, while an ESP32 processes your commands entirely offline with zero cloud dependency. This kit teaches you how to build an edge AI voice command recorder that drives two relay channels, making it ideal for smart home automation projects, assistive technology prototypes, and hackathon demonstrations.
What You'll Build
You'll assemble a working voice-controlled switchboard that uses a 0.96-inch OLED to display recognized keywords and two relays to toggle appliances based on your trained voice triggers. The project includes soldering the ESP32, INMP441 microphone, and relay modules onto a PCB prototype board, resulting in a compact, standalone device that operates without any WiFi or Bluetooth.
What You'll Learn
- Deploy TensorFlow Lite Micro for offline voice keyword spotting on an ESP32
- Sample and preprocess I2S audio with INMP441 for on-device inference
- Trigger relay outputs based on custom voice commands with noise robustness
- Solder prototypes with pull‑down resistors and decoupling capacitors for stable operation
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| INMP441 I2S Mic | 1 |
| 5V Relay Module | 2 |
| 0.96in OLED | 1 |
| 5mm LED | 3 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 5V 2A PSU | 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 and EEE students building final-year projects, Smart India Hackathon participants prototyping voice-controlled solutions, and ATL Tinkering Lab mentors seeking a real-world edge AI example. It’s also perfect for IIT, NIT, VIT, and BITS Pilani students exploring on-device machine learning or preparing for technical interviews where embedded ML skills stand out.
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?
Scan the QR code in the box to access your AI companion trained on this exact kit. It walks you through every step, and if you still need help, our WhatsApp support team responds within the day.
Does the kit need an internet connection for voice recognition?
No. All audio processing and keyword detection runs locally on the ESP32 using an optimized offline model. The device works in complete isolation from the cloud.
Can I add my own custom voice commands?
Yes, the AI companion includes instructions for collecting audio samples and retraining the model using Python and Edge Impulse or TensorFlow. You can extend the vocabulary to suit your project.
What appliances can the relays safely control?
The 5V relay modules can switch loads up to 10A at 250V AC. You can connect fans, lamps, or small pumps, but always follow the safety guidelines provided and consider using an enclosure for mains wiring.
Voice — ESP32 runs edge voice keyword spotting. Detected keywords control GPIO without cloud — fully offline AI control.
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.
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