Proximity Shirt

Is there a project on the site that duplicates what the two proximity shirts do that were sold on thinkgeek?

Locked-on proximity shirt: http://craziestgadgets.com/wp-content/uploads/2010/02/proximity-sensing-shirt.gif
Zelda hearts proximity shirt: http://www.thegreenhead.com/imgs/proximity-based-dynamic-life-shirt-3.jpg

I am not trying to make my own shirts but I am interested in the tech that makes those two shirts work. If the same results can be duplicated with an ardurino and/or xbee, then that would be great!! Please let me know if that can be done and if yes, could you point me in the right direction. Thanks!

caitlinsdad4 years ago
Some blogs hint that it might be ultrasonic transducers putting out "inaudible" sound. The receiver unit is probably tuned to pick up that sound and it gets louder when the other unit is nearby. It probably doesn't work too well unless there is some line of sight as opposed to real radio waves that can penetrate walls.