Pi 4 Private Voice Assistant Kit with Raspberry Pi 4 + Relay
Pi 4 Private Voice Assistant Kit: Offline Voice Control with Relay
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
You'll build a completely self-contained voice assistant that listens only to you. With a custom wake word, it processes commands like "turn on the lights" entirely on the Raspberry Pi 4, triggering physical relays to control real devices — no internet connection, no data ever leaving your home.
What You'll Build
A private, always-on voice assistant powered by Rhasspy. It responds to your chosen wake word, understands intents you define, and activates relays connected to lights, fans, or any appliance — all without sending a single byte to the cloud.
What You'll Learn
- Setting up Rhasspy offline speech recognition and text-to-speech on Raspberry Pi 4
- Training custom wake words and intent models for local voice control
- Wiring and programming GPIO pins to safely drive 5V relay modules for appliance switching
- Integrating a USB microphone and PAM8403 amplifier with speaker for clear audio feedback
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi 4 Model B 4GB | 1 |
| USB Microphone | 1 |
| PAM8403 Amp | 1 |
| 3W 8Ω Speaker | 1 |
| 5V Relay Module | 2 |
| 1N4007 Diode | 5 |
| M-F Wires | 15 |
| MicroSD Card 32GB | 1 |
| USB-C 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 B.Tech ECE and EEE students looking for a final-year project that showcases edge computing and privacy-first IoT. It's also ideal for Smart India Hackathon teams needing a standalone voice-controlled automation solution, and for makers exploring advanced Raspberry Pi applications at home or in ATL Tinkering Labs.
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, accessible via QR code, provides step-by-step debugging and can escalate to WhatsApp support from our team.
Will this work without internet after setup?
Yes, once Rhasspy is installed on the microSD card, all voice processing happens locally on the Pi 4. No cloud connection is ever required.
Can I control 220V appliances directly with the relay modules?
The included 5V relay modules can switch low-voltage devices; for mains appliances, you'll need to connect the relay's COM and NO terminals to a higher-rated contactor or SSR. Always follow electrical safety guidelines.
Is soldering required?
Yes, you'll need to solder the 1N4007 flyback diodes across the relay coil terminals (as detailed in the build guide) and make some speaker connections. The kit includes a soldering iron and solder wire for this purpose.
Pi 4 runs Rhasspy fully offline. Custom wake word, intent recognition and GPIO relay control. No cloud.
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.
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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