Update: I added the weewx software to the RPi and then proceeded to put the USB interface on the Vantage Vue. But, I didn't turn the power off to the console before mounting it! That I believe is a mistake. Now, I cannot get the weewx to communicate with the console. My only hope is unplugging the power and doing a hard reset to the console. Hopefully the USB port will come up like I want it to. Otherwise, I am out the cost of the USB port and/or possibly a console which was messed up. My setup is below.
I did some thinking about how I wanted to add both a UV and Light (for Solar Radiation) sensor to another RPi and connect it to the weewx software. This should be easy since weewx is written in Python. Here is my idea so far: