Smart home automation doesn’t always need complex hardware or expensive controllers. This project demonstrates a compact and practical AC IoT Switch built using the ESP-01 (ESP8266) module. With Wi-Fi connectivity and a relay-based design, the switch allows you to control AC appliances remotely through a web interface, making it ideal for beginners and DIY enthusiasts exploring IoT.

Project Overview

The AC IoT Switch is designed to safely control mains-powered devices such as lights, fans, or small appliances. The ESP-01 acts as the brain of the system, handling Wi-Fi communication and control logic, while a relay module switches the AC load. The entire circuit is assembled on a small PCB, resulting in a compact and easy-to-install module that can fit inside junction boxes or control enclosures.

Key Features

1. Wi-Fi–enabled AC appliance control
2. Compact ESP-01–based design
3. Relay isolation for safe AC switching
4. Web-based control (no mobile app required)
5. Can be integrated into home automation setups

How It Works

At the core of the project is the ESP-01 (ESP8266) Wi-Fi module. The ESP-01 connects to a local Wi-Fi network and hosts a web interface that allows the user to turn the relay ON or OFF. When a command is received via the web interface: The ESP-01 processes the request, A GPIO pin triggers the relay driver circuit & the relay switches the connected AC load. This simple yet effective approach enables reliable remote control of high-voltage devices using low-voltage logic.

Firmware & Software

For firmware, Tasmota is used due to its stability, flexibility, and ease of configuration. Instead of traditional flashing methods, Tasmota Web Flasher was used to upload the firmware to the ESP-01. This makes the process beginner-friendly and eliminates the need for complex software setups. Once flashed, Tasmota provides: A built-in web dashboard, Device configuration through a browser & Easy Wi-Fi setup and relay mapping

Results

The final build is reliable, responsive, and easy to use. The web-based control ensures compatibility with any device that has a browser, including smartphones, tablets, and PCs. The project proves that powerful IoT solutions can be built using minimal hardware when paired with the right firmware.

Conclusion

This project by Steve Willson Kujur is an excellent example of a simple, functional, and beginner-friendly IoT solution. By combining the ESP-01 with Tasmota firmware, the AC IoT Switch delivers flexibility, ease of use, and real-world practicality—making it a great inspiration for anyone starting their journey into smart home electronics.

Credit & Acknowledgement

This project is shared for educational and community reference purposes.

Complete Design & Engineering Credit: Steve Willson Kujur

This article is shared to respectfully acknowledge and highlight the original creator’s work within the PCBWay community, encouraging learning, experimentation, and collaboration.