A LilyPad Arduino wrist warmer.
The wrist warmer has a temperature sensor and five LEDs sewn in, so it senses and responds to the ambient temperature.
If the temperature drops below 12°C, the lights start fading in and out. If the temperature is 1°C or below, the lights twinkle.
Full how-to and code for this project is at: http://alysonfielding.com/?p=19
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