[John Petersen] created a very cool piece of wearable technology for him and his son. Eager to explore the Maker Fair, but not eager to lose his son in the crowds, he’s come up with the Seeker Hat — a kind of auto-locating GPS hat which always points towards the other.
It’s a clever setup that makes use of a GPS module, a microprocessor, a xBee wireless chip, a compass, and LEDs to light the way. The GPS determines the hat’s approximate location, the xBee transmits it to the other hat, the digital compasses determine the directions of both hats, and the microprocessor figures out the azimuth, resulting in a difference in trajectory of the two — a strip of LEDs, like landing lights, direct you in the right direction.
In the future, [John] wants to create a mesh network so more than two hats can participate, and maybe even make a handheld “locator” device as well, instead of a hat — but the biggest problem he faced was that his son would turn off his hat. Kids.