GPIO 1 into 2: This breakout board expands one ESP32 GPIO pin into two outputs, helping you reuse pins across projects. Breadboard-friendly for quick prototyping and flexible wiring. Double-layer PCB: The expansion board uses a two-layer design with the signal connected on both sides, delivering a stable circuit and reliable signal transmission. 2 connection options: Pin Header and Screw Terminal. Choose the connection type that best fits your setup and wiring preferences. Compatibility (IMPORTANT): Only suitable for the 38PIN narrow version ESP32 without mounting holes. Not compatible with other ESP32 versions. Use scenarios: - Prototyping on a breadboard: Split a single GPIO to drive two peripherals or routes, such as two indicators or a sensor and a module, without repurposing pins. - Secure, vibration-free wiring: Use the screw terminal for reliable connections in portable or bench-top projects. - Flexible test benches: Quickly access a single GPIO from two points to simplify testing and experimentation without altering the main board wiring.