Iron Man fanatic Ryan Brooks, who calls himself „the real Tony Stark,“ has recreated a fully-functional helmet that Tony Stark would be proud of, with a 3D-printer. He used an Arduino Pro Mini and an Adafruit accelerometer to rig the helmet’s faceplate to open and close based on which way the wearer nods.
Here’s what Dvice has to say: „By nodding backwards, the faceplate seamlessly opens and locks into place, while nodding with a forward motion will close it. Brooks is currently selling iterations of his servo mechanism on his website, starting at $150. Brooks also added „Jarvis“ voice action to the helmet that tells you if it is booted up and ready, along with air lock and „whoosh“ sound effects when the faceplate opens and closes.“
Official Source: http://www.dvice.com/2013-11-15/3d-printed-iron-man-helmet-opens-and-closes-nodding-your-head