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The Crowbits-UNO is a microcontroller board that completely compatible with the Arduino UNO. It is based on the Atmega328P, which is widely also used in the Arduino Uno.
The function pin of UNO is led out to facilitate the docking of other functional modules. As a bridge for communication between each module and the main control, so as to realize the data receiving and sending between each module and the main control board.
Burn code into UNO, access to relevant information or output signals for control.