[Jeri] threw down the geeky fashion gauntlet by building this LED enhanced dress. She chose to assemble the project for her trip to BarBot 2011, and we can’t think of a more appropriate setting for such a garment. It uses a motion sensor to set off a delayed pattern of blue lights hidden underneath the fabric.The best part of the hack is the instamatic camera. It looks like a fashion accessory, but it’s really hiding all of the circuitry for the lights.
Inside the camera a PIR sensor waits until it detects motion, sending a signal through an op-amp to the trigger circuitry. A 74LS14 Schmitt Trigger chip teams up with some resistor-capacitor timer circuits to build a delay chain for the LEDs. This way, after motion is detected the LEDs come on and off in a staggered pattern that doesn’t require a microcontroller and is very pleasing to the eye. See the Analog win for yourself after the break.