In this video, I’ll show you how to create a smart home automation system using a NodeMCU (ESP8266), a 4-channel relay module, and the Cadio app. You’ll learn how to connect and control home appliances like lights or fans from your smartphone — from anywhere in the world! This is a beginner-friendly project that’s perfect for anyone interested in IoT, DIY electronics, or home automation. Github File : 🔧 What you’ll learn: Wiring the NodeMCU with a 4-channel relay Setting up the Cadio app Controlling devices via Wi-Fi Uploading code via Arduino IDE 💡 Components Used: NodeMCU (ESP8266) 4-Channel Relay Module Cadio App (Android/iOS) Jumper Wires & Breadboard AC/DC appliances (bulb, fan, etc.) 🔌 Wiring Diagram (Relay to NodeMCU) Relay Module Pin NodeMCU GPIO IN1 D1 (GPIO5) IN2 D2 (GPIO4) IN3 D5 (GPIO14) IN4 D6 (GPIO12) VCC or 5V GND GND ⚠️ Make sure your relay supports logic or use a level shifter. 📲 Cadio Website : 👍 Don’t forget to Like, Share & Subscribe for more cool electronics projects! 💬 Got questions or suggestions? Comment below! — 🎥 Subscribe for More DIY Projects: @dharanicreations 📸 Follow us on Instagram: 📸 Follow us on LinkedIn :