Learn how to create a Bluetooth-enabled smart home light bulb system using an ESP32 microcontroller, 5V relay module, and Arduino IDE in this comprehensive tutorial. Build a 240V/9W light fixture controllable via an Android smartphone. Follow step-by-step instructions covering component introduction, assembly of the light bulb fixture and microcontroller device, relay connection, Arduino IDE setup and code upload, and smartphone pairing. Gain insights into powering the device independently. Exercise caution when handling high-voltage components. Access provided code, Fritzing diagrams, and recommended Android app for complete project implementation.