4 ms·
Does anyone know, in general, if a watch device already has a pulse measurement LED system, whether that can also serve as a pulse ox measurement? or are they
by supernova87a 6y ago
Does anyone know, in general, if a watch device already has a pulse measurement LED system, whether that can also serve as a pulse ox measurement? or are they different hardware requirements?
- pps43 6y agoYou need two LEDs (one visible, one IR) to measure oxygen level, but only one for pulse.
- wlesieutre 6y agoApple has apparently had both since their first watch models, but only uses them for heart rate. https://www.theverge.com/2014/9/9/6126991/apple-watch-four-back-sensors-detect-activity https://www.theverge.com/2014/9/9/6126991/apple-watch-four-b... EDIT: Apple says it uses green LEDs during workouts and IR for background measurements. Maybe it’s for energy reasons? https://support.apple.com/en-us/HT204666 https://support.apple.com/en-us/HT204666