ESP8266 Wemos D1 Mini – 8-Channel Relay Home Automation Board

This open-source hardware project brings WiFi-based home automation to your fingertips. Powered by the ESP8266 Wemos D1 Mini, this 8-channel relay control board is perfect for switching AC loads like lights, fans, and smart sockets using Tasmota, ESPHome, or custom Arduino firmware.

Compact, cost-effective, and highly modular — a must-have for smart home enthusiasts!

🧠 Key Features

• ✅ ESP8266 (Wemos D1 Mini) based WiFi control

• ✅ 8x Relay outputs (AC/DC control – 10A each)

• ✅ Integrated ULN2803A driver IC

• ✅ 5V isolated AC-DC supply using HLK-PM01

• ✅ Indicator LEDs for each relay

• ✅ Screw terminals for AC appliances

• ✅ Works with Tasmota, ESPHome, Home Assistant, MQTT, etc.

DEMO Project File Here
GITHUB

🧰 Bill of Materials (BOM)

All parts are easy to source from LCSC or local markets.
📥 Click here to download full BOM Excel

🔌 Relay to GPIO Mapping

🖼️ Project Visuals

🔷 Top View

🔷 3D View

🔷 Schematic View

📁 Downloads

• 📐 Schematic PDF

• 📦 Gerber – Normal

• 🎨 Gerber – Color Silkscreen

📸 Real Use Example

Control up to 8 AC devices in real-time via WiFi. Works perfectly with MQTT, Tasmota dashboards, or ESPHome + Home Assistant setups.

💡 Use Cases

• Smart light and fan automation

• Local or cloud-based appliance control

• ESPHome + Home Assistant integration

• DIY switchboard automation

• Retrofit old appliances with smart control

📫 Developer Info

• 🔧 Made by: Manoranjan Das

• 📧 Email: electroiot.in@gmail.com

• 🌐 Website: https://electroiot.in 

• Feel Free To Email Me Any Problem And Update

🙏 Special Thanks

Huge thanks to:

• 🛠️ EasyEDA – for the incredible PCB design platform

• 📂 OSHWLab – for enabling open hardware sharing

This project is open hardware. Contribute, improve, remix, and share.

📃 License

This project is released under the Open Source Hardware (OSHW) Certification.

💡 Happy Automating!
🛠️ Built with passion for the maker community.