sensors
Pulse with light: how a wristband reads your heart from outside
How a wristband knows your pulse using only light: what photoplethysmography (PPG) is, how it works out pulse, HRV and SpO2, and why it sometimes errs.
How a wristband knows your pulse using only light: what photoplethysmography (PPG) is, how it works out pulse, HRV and SpO2, and why it sometimes errs.