ECE Lab Kit 20 Voice Controlled Relay
Build an Offline Voice-Controlled Relay with Raspberry Pi Zero 2W — ECE Lab Kit 20
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 speaking a command — “light on” — and instantly seeing a relay click, no internet required. This kit equips you to build a fully functional voice-controlled relay using offline speech recognition. A USB microphone captures your voice, the Vosk engine on a Raspberry Pi Zero 2W decodes the command, and Python scripts trigger a 4-channel relay module to control real appliances. It’s a complete embedded AI lab project for ECE students and makers exploring voice automation without cloud dependency.
What You'll Build
You’ll assemble a compact voice-activated relay module that responds to spoken commands like “fan off” or “light on” without any internet. The Raspberry Pi runs Vosk offline, processes the audio stream, and toggles the relay channels based on your predefined words. The final hardware can switch lamps, fans, or small motors — a tangible demonstration of edge AI that fits neatly into a classroom or smart automation project.
What You'll Learn
- Offline speech recognition pipeline using Vosk on Linux
- GPIO control of multi-channel relay modules via Python
- Audio signal capture and processing with a USB microphone
- Integration of voice commands into IoT automation projects
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi Zero 2W | 1 |
| 5V 4-Channel Relay | 1 |
| USB Microphone | 1 |
| MicroSD Card 16GB | 1 |
| Micro USB Cable | 1 |
| M-F Wires | 15 |
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 designed for B.Tech ECE and EEE students tackling voice-based automation lab assignments, as well as CBSE Class 11-12 students exploring embedded AI for competitions. It’s equally valuable for Smart India Hackathon teams, ATL Tinkering Labs, and faculty at IITs, NITs, VIT, and BITS Pilani who need a ready-made offline speech recognition system.
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 on the box to chat with the AI companion trained on this exact kit. You can also reach our team via WhatsApp for direct support.
Does the speech recognition work without internet?
Yes. The Vosk speech recognition engine runs entirely offline on the Raspberry Pi. No cloud or internet connection is needed once the software is set up.
Can I customise the voice commands?
Absolutely. You can define your own command list and labels in the Python script, or even train a custom Vosk model for specific words.
What appliances can the relay control?
Each relay channel can switch up to 10A at 250V AC, suitable for light bulbs, fans, or small motors. The kit includes a 5V 4-channel relay, giving you four independent outputs.
Raspberry Pi Zero 2W runs vosk offline speech recognition — recognised commands trigger relay outputs.
What's in this kit
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
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