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.
- 📱 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
| 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 |
- 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.
Working photos and video demos available in the images/ and videos/ folders.
smart-home-relay-esp8266/
├── README.md
├── videos/
│ └── demo_video.mp4
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
- 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!