How do smartwatches collect so much data? Heart rate, steps, sleep quality, etc.—what sensors are used to measure all of this? What’s the working principle behind these sensors? I hear terms like PPG and accelerometer all the time, but I don’t know the details. Which sensors do you think are the most critical?
How do the sensors in smartwatches work?
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I'm curious about which sensors in smartwatches collect so much data, especially since I don't understand terms like PPG and accelerometer. How do they measure heart rate or count steps? Could you explain a bit more?