It is about the presence of the SDA, SCL, and IOREF pins, which the previous pinout version did not have. The second one is a not connected pin, that is reserved for future purposes.īut when you see "R3" or "Rev3" mentioned in the context of accessory products or derivative boards, what they actually mean is "1.0 pinout". In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board.Revision 3 of the board has the following new features: The meaning of "R3" in the context of the official Arduino Uno is explained on the product page:
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