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Originally Posted by Geek 2.0
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I have one of the Arduino Duemilanove boards
http://arduino.cc/en/Main/ArduinoBoardDuemilanove that i bought for playing around with awhile back and i'm pretty sure that the board i have is based off the same chip. On mine there are both serial and I2C ports. I have actually used the I2C ports on the board to interface with a memory chip in a Cat Genie solution cartridge and tell the chip there are more wash cycles left in the cartridge then there are.
If you look at the 2nd page of the schematics
http://www.sparkfun.com/datasheets/S...-Razor-v13.pdf Pins 27 and 28 are the SCL and SCA pins used for I2C as well as being analog inputs. I'm not sure if these are used or not on the board for one of the many sensors or if you could some how hijack them and use them to send I2c back to the crio or not.
According to the Arduino website by using I2C: 4 (SDA) and 5 (SCL) is supported I2C (TWI) communication using the Wire library.