For the last 2 years I have been working on a FPS melee where you have total control of your movements. I enjoy prototyping projects with the Arduino, so I included an Arduino integration so anyone could rapid prototype their own virtual reality controllers or make unique haptic feedback devices. I think this will provide a great platform for further innovation in virtual reality.
Please check out my video, I talk about the Arduino integration toward the end: https://www.kickstarter.com/projects/1773037999/reverence-the-ultimate-combat-experience