I tried a few things tonight.
Setting the arduino to send a letter over a serial connection on a button press works.
I tried a program called Keyinjector, but it was a trial and I couldn't make use of it. There were a couple others I tried, and although they output that same letter in Notepad, it isn't detected in-game as a keyboard button press that is mappable.
Anyone know of a solution?
A virtual HID keyboard program that converts serial-in data to keystrokes would be perfect.
I'm using this to setup a handbrake for a racing sim setup i'm building. Here's a picture of my prototype setup as of tonight.
Monitor needs a better mount, table needs angled front legs, and I need to make a mount for the TM1638 display. When the rest of my displays come in, i'll mount those up.