# \[Free\]\[Windows only\] UE4Duino 2 - Arduino (COM port) communication **URL:** \ **Category:** Programming & Scripting\ **Tags:** unreal-engine\ **Created:** [June 27, 2017, 12:46am UTC](https://forums.unrealengine.com/t/free-windows-only-ue4duino-2-arduino-com-port-communication/95217 "2017-06-27T00:46:47Z")\ **Posts on this page:** 1\ **Showing post:** 8
**Author:** ![anonymous\_user\_8987ab27](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_8987ab27](https://forums.unrealengine.com/u/anonymous_user_8987ab27)\ **Post date:** [July 15, 2017, 10:09pm UTC](https://forums.unrealengine.com/t/free-windows-only-ue4duino-2-arduino-com-port-communication/95217/8 "2017-07-15T22:09:08Z")
Important question: Everything works perfectly fine in the editor. When I build the “windows no editor version” the port doesnt open… tryed with a delay or keypress but the port doesnt open and on the download page there there are 2 download versions 2.2.1 4.16 and 2.2 4.16.1 which makes it a bit confusing what is the newest. Anyway don’t get me wrong, the thing is perfectly documented and I had a 3 step Fan working in half a day so thanks a lot! Hope you can help with how to open the port on a windows no editor build. And this is the warning: LogPluginManager:Warning: Engine version string in D:/Gebruikers/Gebruiker/Nieuwe map - kopie (3)/Unreal Projects/arduino\_1/Plugins/UE4Duino/UE4Duino.uplugin could not be parsed (“4.16”) Did some research myself, I guess this link is part of the solution, at least I hope. > **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)** > > After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — https://unrealcommunity.wiki/! You will be able to find content from... BTW: I use arduino to 4x relay and UE4 version 4.16.2 --- _[View the full topic](https://forums.unrealengine.com/t/free-windows-only-ue4duino-2-arduino-com-port-communication/95217)._