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This is a device you wear on your forearm while swimming. It uses a special pressure sensor, called a barometric altimeter, to detect when it goes underwater. By tracking these pressure changes, the device figures out what kind of swim stroke you're doing, like freestyle or breaststroke, and then tells you.
Why it matters: Filed before widespread edge AI for sensor data. Modern microcontrollers and machine learning models can now process altimeter data for nuanced stroke detection on-device, making the 'control logic' more powerful and accurate.
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