Hi, I am trying to communicate between my Arduino and Raspberry pi over serial. I have a duemilanove and uno to work/test with. It works great when i feed the data into the TX RX ports on the Arduino. I would like to communicate over usb so I sent the data into the USB data pins. So far this has been unsuccessful. I know the data is entering the usb correctly because it works when I add a jumper between the TX RX pins the the usb solder joints on the board. While trying to find an answer, I ran across this - http://playground.arduino.cc/Main/DisablingAutoResetOnSerialConnection I don't know if it is related to my problem. I followed the steps with no avail. More specifically, I tried adding the resistors to both the duemilanove and uno. I also tried the the 10uf capacitor on the uno. Does anyone know why this might be happening? Any Suggestions?