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That's the case with StickNFind - circular stickers the size of a few 10p pieces stuck together which contain a Bluetooth chip, temperature sensor and battery.
BBC: CES 2013: Ready for the wearable tech revolution
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Runners and cyclists of all levels will now be able to better track, analyze and improve their performance by wirelessly sending sensor data to one of the growing number of Bluetooth v4.0-enabled smartphones or tablets on the market.
ENGADGET: Bluetooth SIG releases certifications for fitness devices aimed at runners and cyclists
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What our man Pascal Brisset did is design a Linux system around a Gumstix Overo Fire computer-on-module, a Vuzix VR920 head-mounted stereoscopic 640 x 480 display (complete with 3D tilt sensor and 3D magnetic compass), WiFi, and Bluetooth modules -- the whole shebang resides in (and on) the eyewear, just the thing for secure telepresence and augmented reality applications (or just extra-private web browsing).
ENGADGET: Homebrew head-mounted Linux system for telepresence, looking silly
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In use, the sensor is estimated to last 15 hours while not paired via Bluetooth to the iPad, or six hours when it is paired.
WSJ: Pen and Paper Find a Place in the Digital World
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If the iPad isn't nearby or isn't connected via Bluetooth, up to 100 pages of writing can be stored on the sensor by pressing a small button on the sensor.
WSJ: Pen and Paper Find a Place in the Digital World
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The sensor data are processed by a microcontroller on the glove then sent via Bluetooth to a mobile device, which translates the positions of the hand and fingers into text when the pattern is recognized.
FORBES: Smart Gloves Turn Sign Language Gestures Into Vocalized Speech
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Back in March, Switched On discussed a number of Kickstarter projects (all of which have now shipped) that extended sensor-based monitoring and notification to remote locations (provided there was WiFi or Bluetooth connectivity).
ENGADGET: Switched On: The fork, the ficus and the flandoodle
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Inside, the device is home to all the usual radios and sensors, including Bluetooth 3.0, a gyroscope, e-compass, aGPS, an ambient light sensor and a G-sensor, with either 16GB or 32GB of internal storage.
ENGADGET: ASUS Transformer Pad TF300 review
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Our PSoC products are well suited for Bluetooth low energy applications in this market, as their programmable analog and digital peripherals can interface with almost any sensor to provide integrated one-chip solutions to our customers.
ENGADGET: Bluetooth SIG releases certifications for fitness devices aimed at runners and cyclists