Hi Ian and Boris,
I'm running Vasari Beta 2 and Vasari_Beta1-0_WIP_Dynamo_Add-In_20121130
Attached is a zip file with some screen grabs describing my test project as well as a .dyn, .rfa and .ghx file for Dynamo/Vasari and Grasshopper respectively.
After skimming over the above, I know that I am receiving photoresistor values from Analog A0 on COM3 as demonstrated in Grasshopper, and get sample feedback of "284,281,278,275,271,267,1,0,0,eol" when I do a Serial Monitor check from the Arduino software with nothing else running.
I thought at first that maybe the Arduino node was 'closed' as there is no boolean toggle as found in a way older previous version of Dynamo which I've screengrabbed. However, I'm convinced that's not the case after looking at the dynArduino.cs file Matt updated on GitHub. It also appears that Matt changed the watch value to a string rather than a parsed number, which might give me back the values I've listed above, when there is an updated release with those changes.