This is the problem. My home version is 10.0 . This is why it worked on my lab where running 10.1. Si with veriuon 10.1 , i do not have to upload the sketch to Arduino? Averything runs from Methematica ?

This is a follow up.. There is something nor notmal in mathematica with the Arduino devices. For no apparent reason now can not detect the board

DeviceOpen["Arduino", "COM3"];

DeviceOpen::noclass: A driver for Arduino was not found on your local computer or currently available paclet sites. If you can locate the driver, add the driver directory to $Path or load the driver directly with Get. If you cannot locate the driver, contact the device manufacturer or create a driver using the Wolfram Device Framework. See http://devices.wolfram.com for more information. >>        

Any idea what is possible that I am doing wrong?