Local AI Voice Command Device Kit with ESP32 + Relay
Build an Offline Voice-Controlled IoT Device with the ESP32 Local AI Voice Command Kit
Every part needed to build a fully offline AI voice command system, 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 lights, fan, or any appliance just by speaking a keyword — without the internet, without cloud subscriptions, and without voice assistants listening to your conversations. This kit lets you build a local AI edge device that processes voice commands entirely on the ESP32, triggering relays in real time. Perfect for privacy-focused smart home enthusiasts, engineering students exploring embedded AI, or anyone who wants an offline voice control system they fully own.
What You'll Build
You'll assemble a compact voice command module featuring an INMP441 I2S microphone, an OLED display for feedback, and two 5V relays to switch external devices. The system uses an on-device keyword spotting model trained to recognize phrases like 'light on' or 'fan off' — all processing happens on the ESP32, so no data ever leaves your local network. You can personalize keywords and connect it to home automation setups via the relays.
What You'll Learn
- Edge AI inference: Deploy a keyword-spotting neural network on an ESP32 using TensorFlow Lite Micro or Edge Impulse
- I2S audio capture with INMP441 microphone and real-time audio processing
- Interfacing relays, OLED displays, and LEDs with ESP32 GPIO
- Practical embedded system design, PCB prototyping, and soldering techniques for a complete IoT project
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| INMP441 I2S Mic | 1 |
| 5V Relay Module | 2 |
| 0.96-inch OLED Display | 1 |
| 5mm LED | 3 |
| 4.7kΩ Resistors | 5 |
| 100nF Ceramic Capacitors | 10 |
| PCB Prototype Board | 2 |
| 5V 2A Power Supply Unit | 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 kit is tailored for B.Tech ECE, EEE, and CSE students working on embedded AI projects, Smart India Hackathon teams prototyping offline automation solutions, and advanced hobbyists who have prior microcontroller and soldering experience. If you're exploring on-device ML for privacy-first IoT and want a hands-on, end-to-end build experience, this kit gives you everything you need — including a pre-trained keyword model that works without Wi-Fi.
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 to chat with the AI companion, trained on this project's schematic and codebase. If you need human support, reach us on WhatsApp or email for guidance within 24 hours.
Does this kit work without internet?
Absolutely. The keyword spotting runs entirely on the ESP32; no data is sent to the cloud. The AI model is loaded onto the board and processes locally, giving you 100% offline voice control.
Can I customize which keywords the device responds to?
Yes. The AI companion includes instructions to retrain the keyword model with Edge Impulse or TensorFlow Lite using your own wake words and commands, so you can tailor it to your specific application.
What appliances can I control with the relays?
The two 5V relays can switch AC or DC loads up to 250V/10A, making them suitable for lights, fans, motors, or other home appliances. The companion guide includes snubber circuit recommendations for inductive loads.
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