Voice Command Recorder Advanced Kit with ESP32 + Relay
Voice Command Recorder Advanced Kit: Build an ESP32-Powered Voice-Activated Emergency Stop System
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Say a critical stop word near a dangerous machine, and within 100 milliseconds, the dual relays cut power while the system logs the event timestamp to an SD card and flashes a warning on the OLED display. This kit gives you all the hardware to prototype a WakeNet-driven emergency safety cut-off — the same kind of voice interface used in smart factories where immediate shutdown can prevent injury.
What You'll Build
You’ll assemble a DIN rail-mounted emergency stop system that continuously listens for a trained wake word (like ‘alert’ or ‘stop’) using dual I2S microphones. When recognized, it instantly deactivates two relay channels, sounds an alarm, and logs the incident with precise RTC timestamps — ready for safety audits or industrial project demonstrations.
What You'll Learn
- Configure WakeNet keyword spotting on an ESP32-S3 with I2S digital microphones for reliable, low-latency speech recognition
- Design fail-safe relay circuits with flyback diodes and safe power-down sequences for industrial machinery
- Implement real-time SD card logging with DS3231 RTC timestamps for compliance-ready event records
- Interface an OLED display and active buzzer to create a visual and audible alert system
Kit Contents
| Component | Quantity |
|---|---|
| ESP32-S3 Dev Board | 1 |
| INMP441 I2S Mic | 2 |
| 5V Relay Module | 2 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| Active Buzzer | 1 |
| 1N4007 Diode | 5 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| DIN Rail Enclosure | 1 |
| 12V 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 kit is built for final-year B.Tech students in ECE, EEE, or Mechatronics who need a safety automation project that demonstrates real-time embedded AI. It’s also a powerful prototype for Smart India Hackathon teams tackling industrial IoT challenges, or for ATL Tinkering Lab mentors guiding advanced tinkering with voice interfaces and safety-critical relay designs.
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 build companion, trained on this exact kit, offers instant step-by-step help; you can also reach us on WhatsApp for human guidance.
Can this system recognize custom wake words?
Yes, WakeNet supports training a small vocabulary of keywords, and the companion guide will show you how to record your own and deploy them on the ESP32-S3.
Is the relay activation truly within 100ms?
When you use the pre-tuned WakeNet model provided, the ESP32-S3 processes the keyword and triggers the relay in under 100ms — timing is verified through the SD log timestamps.
Does this kit include everything I need for the enclosure?
Absolutely, the DIN rail enclosure, PCB prototype boards, mounting hardware, and all tiny passives are included, giving you a compact, rail-mountable unit ready for demo or lab inspection.
Voice — WakeNet listens for stop keyword near dangerous machinery. Triggers emergency relay within 100ms, logs to SD.
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