This project showcases a high-current IoT relay switch (up to 30A) built around the ESP8266, designed for safely controlling heavy electrical loads through Wi-Fi. It’s a practical solution for smart home automation, power control, and DIY IoT applications where reliability and simplicity matter.

Project Overview

The core of the design is an ESP8266 module paired with a 30A relay, allowing users to remotely switch high-power AC or DC loads. The PCB layout keeps power and control sections properly separated, ensuring safer operation while maintaining a compact form factor.

The relay can handle loads ranging from very low currents (~10 mA) up to 30A, making it suitable for lights, heaters, motors, and other appliances.

Firmware & Configuration

1. One of the best parts of this project is how easy it is to get started with the firmware.
2. Firmware flashing: Done directly from the browser using web.esphome.io
3. No external tools required: Just a USB connection and a supported browser
4. Configuration: Managed using a simple ESPHome YAML file
5. With ESPHome, the relay can be quickly integrated into Home Assistant or other compatible platforms. The YAML-based setup makes customization straightforward, even for beginners.

Why This Project Is Useful

1. Supports high-current loads (up to 30A)
2. Simple web-based firmware flashing
3. Easy customization using YAML
4. Ideal for DIY smart switches, automation panels, and IoT experiments

Conclusion

This project is shared as part of a community innovation exchange, highlighting practical and reproducible IoT designs that makers can learn from, adapt, and build upon. If you’re looking for a powerful yet beginner-friendly IoT relay solution, this ESP8266-based 30A switch is a solid reference design.

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.