Comment on BOT BIRDS by j.k.harwood2

j.k.harwood2 · 9/15/2026, 9:02:23 PM · permalink

Wi-Fi can detect a person's heartbeat by analyzing microscopic disturbances in radio waves as they reflect off the human body using a method called Channel State Information (CSI) sensing. \[1\] (https://www.youtube.com/watch?v=Cf6_PGuEiZY), \[2\] (https://www.youtube.com/watch?v=oBDX_dPvq4A&t=6)How Wi-Fi Sensing WorksRadio wave reflection: Routers or low-cost Wi-Fi transceivers continuously bounce invisible 5 GHz radio waves off walls, furniture, and bodies in a room. \[1\] (https://www.youtube.com/shorts/t7bBuDEJc4A), \[2\] (https://www.youtube.com/watch?v=oBDX_dPvq4A&t=6), \[3\] (https://www.youtube.com/watch?v=Cf6_PGuEiZY)Channel State Information (CSI): Devices track CSI data, which details how signals change along their path. \[1\] (https://www.youtube.com/shorts/t7bBuDEJc4A)Subtle surface motion: When a heart beats, it causes tiny physical micro-movements on the human chest wall and skin. These minuscule shifts alter the reflected Wi-Fi signals in a very specific pattern. \[1\] (https://www.govtech.com/question-of-the-day/can-wi-fi-track-your-heart-rate), \[2\] (https://www.youtube.com/watch?v=Cf6_PGuEiZY)Isolating the HeartbeatFiltering background noise: Advanced algorithms and machine learning models subtract the baseline signature of an empty room and filter out larger movements like walking or breathing. \[1\] (https://www.youtube.com/watch?v=Cd03lFwUq0E&t=12), \[2\] (https://www.electronicsforu.com/technology-trends/wi-fi-can-track-your-heart-rate-without-any-wearables), \[3\] (https://www.govtech.com/question-of-the-day/can-wi-fi-track-your-heart-rate)Decoding frequencies: Systems isolate the ultra-faint frequency band associated with cardiac activity (roughly 0.8 to 2.0 Hz) from the slower breathing rhythm band. \[1\] (https://www.youtube.com/watch?v=Cd03lFwUq0E&t=12)Clinical accuracy: Recent breakthrough projects like IEEE Spectrum research on Pulse-Fi use neural networks to process these tiny wave fluctuations, achieving error rates of less than 1.5 beats per minute without any physical contact. \[1\] (https://spectrum.ieee.org/wi-fi-signal-heartbeat-detection), \[2\] (https://www.govtech.com/question-of-the-day/can-wi-fi-track-your-heart-rate)Watch this video to see a practical demonstration and breakdown of how inexpensive hardware uses Wi-Fi signals to detect vital signs:
![video](https://www.youtube-nocookie.com/embed/Cf6_PGuEiZY)

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