"Heart rate monitoring has been a mainstay of health and fitness, and while the stethoscope has given way to more precise electronic measuring devices, they've always involved , or, in recent years, devices worn on the or . But what if there were a way to measure your heart rate wirelessly ... using Wi-Fi? Also: Internet running slow? 3 things I always check first for faster Wi-Fi speeds at home This is exactly what researchers at the University of California have pulled off recently."
"Using the way Wi-Fi signals permeate the environment, they analyzed how a beating human heart affected the Channel State Information (CSI -- part of the Wi-Fi signal that contains information about how the signal moves from the transmitter to the receiver). Also: I've tested the Apple Watch, Oura Ring, and other sleep trackers - 5 tips to get the best results They came up with a non-intrusive, continuous heart rate monitoring system called Pulse-Fi."
Researchers extracted heartbeat data from Wi‑Fi Channel State Information by isolating CSI components caused by cardiac movements and removing environmental noise. The pipeline applies a bandpass filter targeting 0.8–2.17 Hz (48–130 beats per minute) and an additional filter to reduce noise while preserving necessary signals. Two datasets were collected using inexpensive ESP32 modules (~$5 each) and Raspberry Pi hardware ($30–$50) and compared against simultaneous traditional medical measurements. The processed CSI data is analyzed using a low‑compute model to estimate heart rate, achieving accuracy of 99.81% compared with medical methods.
Read at ZDNET
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