arduino:unofaq
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arduino:unofaq [2011/11/29 18:31] ladyada |
arduino:unofaq [2011/12/01 05:27] ladyada [UNO R2 and R3] |
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| - The USB controller chip has moved from an atmega8u2 (8K flash) to an atmega16u2 (16K flash). **This does not mean that you have more flash or RAM for your sketches** this upgrade is for the USB interface chip **only**. In theory this will mean that it will be easier to have low level USB interfaces such as MIDI/Joystick/Keyboard available. **However** these are only theoretical at this time, there is no example code or firmware which will actually do this. | - The USB controller chip has moved from an atmega8u2 (8K flash) to an atmega16u2 (16K flash). **This does not mean that you have more flash or RAM for your sketches** this upgrade is for the USB interface chip **only**. In theory this will mean that it will be easier to have low level USB interfaces such as MIDI/Joystick/Keyboard available. **However** these are only theoretical at this time, there is no example code or firmware which will actually do this. | ||
| - There are three more breakout pins on the PCB, next to the AREF pin there is are two I2C pins (SDA/SCL) - this is a **duplication** of the Analog 4 and 5 pins. There is not an extra I2C interface or anything, its just that they made a copy of those pins there for future shields since the I2C pins are in a different place on Mega. There is also an IOREF pin which is next to the Reset pin - this is to let shields know what the running I/O pin voltage is on the board (for the UNO, its 5V). Again, this is a **duplication** of the power pin, it does not add voltage level shifting to the UNO. | - There are three more breakout pins on the PCB, next to the AREF pin there is are two I2C pins (SDA/SCL) - this is a **duplication** of the Analog 4 and 5 pins. There is not an extra I2C interface or anything, its just that they made a copy of those pins there for future shields since the I2C pins are in a different place on Mega. There is also an IOREF pin which is next to the Reset pin - this is to let shields know what the running I/O pin voltage is on the board (for the UNO, its 5V). Again, this is a **duplication** of the power pin, it does not add voltage level shifting to the UNO. | ||
| + | - The RESET button has moved to be next to the USB connector, this makes it easier to press when a shield is on top. | ||
| Here is what **didn't** change in the UNO | Here is what **didn't** change in the UNO | ||
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| - Upload speed - same upload speed and technique | - Upload speed - same upload speed and technique | ||
| + | If you want to [[http://www.adafruit.com/products/50|get up an Arduino R3 now, visit the adafruit store]] and pick up a board or pack! | ||
/home/ladyada/public_html/wiki/data/pages/arduino/unofaq.txt · Last modified: 2016/01/28 18:05 (external edit)
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