Voice Command Recorder Pro Kit with ESP32 + Relay
Voice Command Recorder Kit: Train Your ESP32 to Recognize 'Lights On' and 'Lights Off' with Edge Impulse
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Transform any appliance into a voice-controlled device without relying on cloud assistants. This kit lets you train an ESP32 to locally recognise the words “lights on” and “lights off” using Edge Impulse’s machine learning platform, then instantly trigger a relay to switch a lamp, fan, or similar load. The result is a privacy‑first, offline voice command module that responds in milliseconds—perfect for school projects, smart home demos, and hackathon prototypes.
What You'll Build
You’ll assemble a compact voice command module that sits on your desk or inside a junction box. Speak “lights on” and the relay clicks, turning on your lamp; say “lights off” to turn it off. The onboard 0.96‑inch OLED displays the recognised command and relay status in real time. The entire system runs completely offline once the model is deployed, so there’s no latency and no data ever leaves the chip.
What You'll Learn
- Record, label, and augment voice samples to build a reliable keyword-spotting dataset
- Train a custom neural network using Edge Impulse and deploy the model to an ESP32 microcontroller
- Interface an I2S MEMS microphone (INMP441) and an I2C OLED display with the ESP32
- Control a 5V relay module safely to switch AC appliances, including best practices for flyback protection with diodes
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| INMP441 I2S Mic | x1 |
| 5V Relay Module | x1 |
| 0.96in OLED | x1 |
| 5mm LED | x3 |
| 1N4007 Diode | x5 |
| 100nF Caps | x5 |
| 400-pt Breadboard | x1 |
| M-M Wires | x20 |
| Micro USB Cable | x1 |
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 CBSE Class 11‑12 students building voice‑recognition practicals, B.Tech ECE/EEE students creating IoT‑based home automation mini projects, and Smart India Hackathon participants integrating offline voice control. It’s also ideal for ATL Tinkering Lab mentors introducing edge AI and for anyone experimenting with on‑device machine learning in India.
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?
Our AI companion guides you step‑by‑step through the Edge Impulse workflow and wiring, and if you need human help, our Bengaluru team is available on WhatsApp for real‑time troubleshooting.
Can I use this kit to control appliances like a fan or heater?
Yes, the relay can handle up to 250V AC at 10A, making it safe for most household appliances. Always ensure proper insulation and, if you’re a student, supervise high‑voltage connections.
Do I need to be an expert in machine learning?
No. Edge Impulse provides a no‑code training environment. You’ll record a few samples of your voice, label them, and the system builds the model. Our companion explains each step.
Is the voice recognition truly offline, or does it require an internet connection?
Once you’ve trained and deployed the model to the ESP32, keyword spotting runs entirely on the chip with zero cloud dependency. Ideal for privacy and latency‑sensitive applications.
Voice — ESP32 runs Edge Impulse keyword spotting. Says 'lights on' or 'lights off' to trigger relay locally.
What's in this kit
- ESP32 Dev Board
- INMP441 I2S Mic
- 5V Relay Module
- 0.96in OLED
- 5mm LED x3
- 1N4007 Diode x5
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x20
- Micro USB Cable
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