Mini Alexa – ESP32 AI Voice Assistant

📌 Overview

Mini Alexa is an IoT-based AI Voice Assistant built using ESP32 that integrates:

• Google Gemini API (AI response generation)
• Deepgram (Speech-to-Text processing)
• Google Text-to-Speech (Audio response output)
• SD Card audio storage system
• Relay-based appliance control

This project demonstrates embedded systems integration, secure API communication, and IoT-based voice automation.

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🛠 Hardware Components

• ESP32 Development Board
• Buck Converter (12V → 5V)
• 12V AC-DC Adapter
• Digital Microphone (I2S)
• I2S DAC Amplifier
• 3W Speaker
• 5V Relay Module
• SD Card Module (32GB)
• RGB LED Indicator
• Custom PCB (optional)

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⚙ System Architecture

Digital Mic
↓
SD Card (WAV Storage)
↓
Deepgram (Speech-to-Text)
↓
Google Gemini API
↓
Google TTS
↓
I2S DAC Amplifier
↓
Speaker Output

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🧠 Features

• Voice command recognition
• AI-powered conversational responses
• Relay-based appliance switching
• Repeat last response feature
• SD card audio storage
• RGB LED system status indicator

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📷 Hardware Prototype

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🔐 Security Notice

• Do NOT upload WiFi credentials.
• Do NOT upload API keys.
• Use config.example.h as a template for sensitive information.
• Avoid using client.setInsecure() in production environments.