Hey guys, the code that I've written/borrowed below is mostly an example of using the commUDF listed at the bottom, just applied to an Arduino with accompanying Arduino code. Uses Serial communication to turn on a LED, then reads a response from the arduino and prints it in the console. I hope it helps   Autoit Code: #include <CommMG.au3> #include <ButtonConstants.au3> #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> Gl