zip file is empty/corrupted (144 bytes means it's really compressed).
An unknown component near the ICSP header - I'm guessing a diode - on the reset line? The schematic doesn't show it, there's no reference designator, and the "Eagle Files". According to the images, untented vias (or at least the annular ring is uncovered) on the top side, making it slightly easier to solder wires to the PCB or short something out. Opens up more possibilities for USB apps! Uses an Atmega16U2 instead of the Atmega8U2 on the previous version. Larger heatsinking copper area for the LM117 regulator. This is great makes it much easier to access with a shield on. Reset button moved from center of board to corner near USB connector. The male pins on the shield above 'reset' (which is currently on a 6-pin header) would interfere with the bulk power supply caps. The added pins are a pretty huge change - Future shields which use these pins won't be compatible with existing Arduinos. It might be good to note all the changes in this board from Rev. Not sure which Arduino or Arduino-compatible board is right for you? Check out our Arduino Buying Guide! The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux). Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. The Uno R3 works with all existing shields but can adapt to new shields which use these additional pins.Īrduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/ Wiring language. The other is not connected and is reserved for future purposes. One is the IOREF that allows the shields to adapt to the voltage provided from the board. In addition, there are two new pins placed near the RESET pin. The Uno R3 also adds SDA and SCL pins next to the AREF. Never fear for accidental electrical discharge, either since since the Uno R3 also includes a plastic base plate to protect it! No drivers needed for Linux or Mac (inf file for Windows is needed and included in the Arduino IDE), and the ability to have the Uno show up as a keyboard, mouse, joystick, etc. This allows for faster transfer rates and more memory. 
In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead of the 8U2 found on the Uno (or the FTDI found on previous generations).
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