Comment on ELI5: how do mobile devices know your movements?

solrize@lemmy.world ⁨3⁩ ⁨months⁩ ago

Step counters use the phone accelerometers which the phone also uses to notice it’s own orientation. I haven’t yet seen a phone that can detect your heart rate by itself. Some watches can do it using an electrical sensor (electromyograph) on your wrist, and send the info to your phone by Bluetooth.

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