To those asking what exactly do I need: I don't know. GroundFungus Thanks for the main processor datasheet.Įr_name_not_found Thanks for the document which has some of the type of info that I might need. You can find Uno derivatives advertised as 'R3' even though they use the CH340 USB chip in place of the ATmega16U2, as well as other miscellaneous hardware adjustments.Īrduino even does it: Arduino Official Store 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:
