Offline Voice-Controlled Relay Kit with Raspberry Pi Zero W - Control Appliances by Room Name, No Cloud

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 "Hey Rhasspy, turn on the living room lights" - and the relay clicks, no internet required. This kit lets you build a completely offline voice-controlled home automation system that respects your privacy. Using a Raspberry Pi Zero W running Rhasspy, a wake word listener, and a 4-channel relay module, you can assign each relay to a room name ("kitchen", "bedroom", "garden") and trigger them by voice alone. Unlike cloud-dependent assistants, your voice commands are processed entirely on the device, ensuring no audio recordings ever leave your network. No data leaves your home.

What You'll Build

A standalone voice command hub that controls up to four appliances (lights, fans, pumps) by spoken room names. Once assembled, the Pi Zero W boots directly into Rhasspy, listens for your custom wake word, and activates the corresponding relay zone. You'll create a compact unit that can sit in a hallway and respond to natural language commands: "turn on kitchen", "switch off garden pump". The relays connect directly to your existing electrical wiring (with proper safety precautions), making it a practical retrofit solution.

What You'll Learn

• Set up a Raspberry Pi Zero W with Raspbian Lite and configure GPIO pins
• Install and train Rhasspy for offline voice recognition with custom wake words
• Wire a 4-channel relay module safely, including flyback diode protection with 1N4007 diodes
• Design and solder audio circuits using PAM8403 amplifier and a 3W speaker for clear responses

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This advanced kit is ideal for engineering students, IoT enthusiasts, and privacy-conscious makers in India. Whether you're a B.Tech ECE/EEE student working on a smart home project, a participant in the Smart India Hackathon building a prototype, or a hobbyist wanting a truly offline Alexa alternative, you'll find this kit a solid foundation. If you've ever wanted to add voice control to your home without relying on Google or Amazon, this is the kit for you. It also suits educators at ATL tinkering labs and researchers at IITs or NITs exploring edge-based voice interfaces.

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.

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.