Double layer PCB for stable and reliable signal transmission - The expansion board uses a double-layer PCB with wiring on both sides. This design enhances stability and signal integrity, reducing the risk of poor connections and unstable signals. Compatibility you can trust - Only compatible with the 38-pin narrow version ESP32 boards that have no mounting holes. - Not suitable for other ESP32 variants or versions. Flexible connection options - Two connection types are provided: Pin Header or Screw Terminal. - Choose the option that best fits your project setup and assembly workflow. GPIO expansion for simple reuse of pins - This breakout board expands one ESP32 GPIO pin into two breakout points, making it easier to reuse pins in projects and on breadboards. Use scenarios - Prototyping and sensor expansion: connect two sensors or indicators to a single ESP32 GPIO to streamline your prototype while conserving I/O availability. - Quick debugging and testing: split a signal to a measurement point and a peripheral without needing additional GPIOs. - Small hobby projects: control two lightweight modules or indicators from one GPIO in simple, space-constrained designs. Notes - Suitable for breadboard-friendly setups. - Use within current and voltage limits of the ESP32 GPIOs; avoid driving heavy loads from a single pin.