What sensors are inside smartwatches and what do they do? For example, what technologies power functions like heart rate monitoring, step counting, or GPS? Could you give a bit more detail?
How do smartwatch sensors work?
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Smartwatches are packed with some serious tech, bro. They usually have things like ECG, optical heart rate sensors (PPG), accelerometers, gyroscopes, magnetometers, light sensors, pressure sensors, and GPS.
For example, the accelerometer tracks your steps while the PPG sensor measures your heart rate. I think the best part is when step counting and heart rate work together—I get pretty accurate readings when I'm tracking my workouts. Some people say accuracy drops when walking, probably because how close the sensor is to your skin and lighting conditions matter.