✅ Smart Home Automation – ESP8266 + Alexa + Manual Switch

This project demonstrates a basic smart home automation system using an ESP8266 microcontroller and a 4-channel relay module. Built as a mini-project for a 3rd-year Electrical Engineering student, it allows control of home appliances like a bulb and socket both via Alexa voice commands and manual switches.

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🛠️ Project Highlights

• 📱 Voice Control via Alexa
• 🖲️ Manual Switch Override (Works without Wi-Fi too!)
• 🌐 Blynk App Integration (for app-based control)
• 💡 Controls Bulbs, Sockets or Any Appliance
• 🔌 Based on ESP8266 & 4-Channel Relay

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🔧 Hardware Used

Component	Description
ESP8266 NodeMCU	Main controller with Wi-Fi
4-Channel Relay Module	For controlling up to 4 devices
Bulb + Socket	Load connected to the relay
Manual Switches	For physical control without Alexa
Power Supply	To power ESP and relay module

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🧠 Key Features

• Dual Control: Works both with Alexa and manual switches.
• Independent Load Control: Each relay channel can be switched separately.
• No Internet? No Problem! Manual switch always works.
• Voice Control: Works with Amazon Alexa using Blynk + IFTTT/Alexa routines.

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📸 Media

Working photos and video demos available in the images/ and videos/ folders.

smart-home-relay-esp8266/
├── README.md
├── videos/
│   └── demo_video.mp4

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⚠️ Note

The original code was implemented using the Blynk app, but is no longer available. However, you can easily recreate the functionality using:

• Blynk + ESP8266
• Alexa + IFTTT (or direct ESP-Alexa libraries)
• 4-channel relay library and digitalWrite in Arduino

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🙋‍♂️ Contribution & Credits

• Designed and implemented by me for a friend’s mini project (3rd year EE, 20 Nov 2022).
• Feel free to fork, clone, or use as inspiration!