4 ms·
Apparently optical heart rate monitors also often fail on dark skin (or have to shine a brighter light, so they run out of battery faster). So they might have a
by mistercow 12y ago
Apparently optical heart rate monitors also often fail on dark skin (or have to shine a brighter light, so they run out of battery faster). So they might have a "racist HP webcam" (https://www.youtube.com/watch?v=t4DT3tQqgRM https://www.youtube.com/watch?v=t4DT3tQqgRM) situation on their hands.
- MBCook 12y agoThis is apparently why Apple uses infrared LEDs in addition to the green ones. Plus the real power drain is when trying to measure heart rate, which the watch only does once every 10m so it probably doesn't make a large difference in battery life.