Compatible with the pin of Arduino Uno, the 2.45-pitch female pin header offers the base for Microduino modules and pins with the same name are connected to the base, making it easy for debugging. Uniformed Microduino interface standard and rich peripheral modules, capable of having a fast and flexible connection and extension with other modules and sensors in accord with Microduino interface standard. Two bases are arranged horizontally with the pins interconnected on the board, making it possible for reducing the stacking height.

• 3V3 constant voltage;
• Onboard power indicator (5V or 3.3V);
• Onboard reset key;
• MicUSB power supply;
• Two Microduino UPIN27 bases are interconnected and arranged horizontally on the board.