Evading motion sensors

For the second part of the badge-hacking project that won first place, creator Zoz Brooks modified a badge from last year's Defcon to create a device that can help someone escape detection by infrared motion detection sensors that are temperature-sensitive.

Inspired by the movie "Sneakers," he added a temperature sensor to the badge that indicates when the room is warm enough for someone to start moving so as not to trigger the motion sensor. A motor on the badge controls two foot-shaped pieces of plastic so that they move at the pace needed to evade detection--two inches per second, giving an indication of how slow someone needs to walk.

August 5, 2009 4:00 AM PDT

Photo by: Joe Grand