Expands one ESP32 GPIO pin to two pins, making it easier to reuse pins in smart home projects and providing a convenient breadboardfriendly breakout for rapid prototyping. Duallayer PCB design with one pin wired on both sides, delivering stable, reliable connections and reducing poor contact or unstable signal transmission. Compatible with 30Pin widebody ESP32 development boards, providing an easy dropin extension for existing setups. Safe and reliable module suitable for a variety of applications, with flexible wiring options to support different project needs. Use scenarios Smart home prototyping: duplicate a control pin to drive two devices (for example, a relay and a sensor) from a single GPIO, simplifying test setups and board layout. Sensor arrays and indicators: split a single GPIO to interface with multiple sensors or indicators while keeping the original pin available for other uses. Debugging and extension: route the same signal to a breadboard for testing while maintaining access to the original GPIO for development and experimentation.