This snazzy wrist band seeks to measure biometric data from the wearer and transmit it to the users Andriod phone. Project already features:
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detection of temperature and body sweating;
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local display of recorded data;
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dispatch values to a smartphone application;
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free data loading to a online cloud;
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data organization in simple graphs that help you understand parameters trend over time and compare them with those of other users.
- can be programmed to explode if you attempt to leave the arena.
Ok so I may have added that last point but there's a great write up of the whole project here (but I actually saw it first via Dangerous Prototypes)