Ian, thank you for the reply. When I turned my computer off and rebooted, its back to not working again. I've included some snap pics of what I'm seeing. Now my operating system is Windows 10 located on my "C" drive. Games and other programs I download from the internet I put on my "D" drive. The version of DCS that I have is the Steam version.
In Pic 1, I'm using windows explorer to navigate to the folder which has DCS-Bios. If I double left click on "connect-serial-port" I get an error message that is shown in Pic 2. If I right click and select Run as administrator I get a different error message that is shown in Pic 3. When I double left click "connect-serial-port" , it does something because it blocks the Comm Port 3 from talking to the Arduino if I try to upload a new sketch while the command window is still open (shown in Pic 4).
I read your post. But not sure how to change active directory in windows explorer. My background is electrical engineering with some programming in assembly language, basic, and fortran from 20 years ago while in college.
Also, not sure how I had it working briefly yesterday. I could see data flowing in the command prompt. But all I was doing was trying things like, opening DCS first, then I'd try running connect-serial-port first, opening arduino program at different times, things like that.
