A little more than a year ago, castAR, the augmented reality glasses with projectors and retro-reflective surfaces made it to Kickstarter. Since then we’ve seen it at Maker Faire, seen it used for visualizing 3D prints, and sat down with the latest version of the hardware. Now, one of the two people we trust to do a proper teardown finally got his developer version of the castAR.
Before [Mike] digs into the hardware, a quick refresher of how the castAR works: inside the glasses are two 720p projectors that shine an image on a piece of retroreflective fabric. This image reflects directly back to the glasses, where a pair of polarized glasses (like the kind you’ll find from a 3D TV), separate the image into left and right for each eye. Add some head tracking capabilities to the glasses, and you have a castAR.
The glasses come with a small bodypack that powers the glasses, adds two jacks for the accessory sockets, and switches the HDMI signal coming from the computer. The glasses are where the real fun starts with two cameras, two projectors, and a few very big chips. The projector itself is a huge innovation; [Jeri] is on record as saying the lens manufacturers told her the optical setup shouldn’t work.
As far as chips go, there’s an HDMI receiver and an Altera Cyclone FPGA. There’s also a neat little graphic from Asteroids on the board. Video below.