Sensors I/O

Optical PPG sensor detecting blood volume changes at 100Hz sampling rate

Triggers stress alert if HR > 120 BPM for 5+ minutes; logs to health timeline

Calculated from R-R intervals; measures autonomic nervous system balance

Low HRV (<30ms) triggers wellness check; contributes 25% to Body Load score

Measures skin conductance via electrodes; indicates emotional arousal

Spike detection triggers stress event; contributes 30% to Body Load score

Infrared thermopile sensor measuring skin surface temperature

Fever alert if >38°C; contributes 5% to Body Load; thermal management trigger

Dual-wavelength LED (red/infrared) measuring hemoglobin oxygen saturation

Alert if SpO2 <92%; emergency SOS if <88% for 2+ minutes

PTT-based estimation using PPG waveform analysis and calibration data

Hypertension warning if systolic >140; logs trends for health reports

Capacitive humidity sensor detecting perspiration and skin hydration

Dehydration alert if <25%; wet bedding detection triggers caregiver notification

Capacitive fingerprint sensor with 508 DPI resolution, FAR <0.001%

Custody verification; device unlock; authorized guardian confirmation

4-electrode bioimpedance measurement at 10 frequencies (DC-500kHz); Cole-Cole model fitting

Cellular Hydration Index (CHI); body composition; intracellular/extracellular water ratio; dehydration alerts