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$\begingroup$What version of Mathematica are you using? In v10.1 and later, there's an "ArduinoLink" in $InstallationDirectory/SystemFiles/Link. I don't know what this (undocumented) package is exactly, it might simply support this. But it is very relevant still because this is what gets loaded when you <<ArduinoLink` ... I don't have an Arduino so I never tried these.$\endgroup$
$\begingroup$I don't have my UNO handy and I haven't tried with this particular package, but as soon as I get a hold of it I'll take a swing at it. In the meantime, have you tried the built-in package that @Szabolcs pointed out? It's clunky and, in my opinion, much more painful to use than the Arduino IDE but it worked correctly when last I tried it.$\endgroup$
$\begingroup$I got it to work with arduino uno and mm 10.0.0. I didn't really use it, I just turned the standby light on and off. I was able to output values also but if I remember correctly, I couldn't get it to read values. I wanted it for data acquisition and so I ended up abandoning the project and decided I would just use labview in the future.$\endgroup$
$\begingroup$Szabolcs- I am using Mathematica 10.2. I looked at the link you posted and that was a huge help! I am able to write values to the Arduino pins now! Thank you! However when I try to read pins from the Arduino using DeviceRead[device,Pin#] it returns " Timed out waiting for response from arduino."$\endgroup$
$\begingroup$@David I have used the ArduinoLink that's built in since 10.1 and it works well for me. I can read and write to pins. We will need more information on exactly what you are trying to do in order to pinpoint your problem, I believe.$\endgroup$
<<ArduinoLink`... I don't have an Arduino so I never tried these. $\endgroup$