New Pulse‑Fi Breakthrough Lets Everyday Wi‑Fi Track Heartbeats — No Wearables Needed
Researchers at the University of California, Santa Cruz unveiled Pulse‑Fi, a system that uses ordinary Wi‑Fi radio waves and machine learning to detect human heartbeats without contact or wearables — accurate within half a beat per minute after short recordings.
- Contactless heartbeat detection using ordinary Wi‑Fi, reported by UCSC.
- Very low cost hardware can run the system — an ESP32 for about $5–$10 or a Raspberry Pi setup near $30.
- Fast, accurate readings — within half a beat per minute after ~5 seconds, improving with longer monitoring (UCSC).
How Pulse‑Fi works
Researchers at the University of California, Santa Cruz built Pulse‑Fi to read tiny changes in Wi‑Fi signals caused by the heart’s motion inside the chest. Wi‑Fi radio waves travel between a transmitter and receiver; even slight chest movement alters those waves. Pulse‑Fi monitors those shifts and applies machine learning to extract a heartbeat pattern.
In experiments the team used an off‑the‑shelf Wi‑Fi module — the ESP32 — which records signal changes while Pulse‑Fi’s model filters out unrelated motion and noise. The researchers report the system can measure heart rate up to about 10 feet away, making it useful in typical rooms and living spaces (UCSC).
Accuracy and testing
Because no public dataset existed for Wi‑Fi heartbeat signals, the team trained Pulse‑Fi on a custom dataset and validated results against standard pulse oximeters and other reference data. Short tests showed accuracy within 0.5 beats per minute after about five seconds, with accuracy improving for longer recordings. The work was peer‑reviewed and presented at the 2025 IEEE DCOSS‑IoT conference, with summaries available via UCSC and reporting at ENN.
Why this matters
Pulse‑Fi opens a path to contactless health checks that do not rely on smartwatches, chest straps, or bedside monitors. For people who forget or cannot wear devices — including many elderly or disabled Americans — a passive system could fill care gaps. Because it uses low‑cost parts, the technology could scale affordably for households, rural clinics, or low‑resource settings (UCSC; Earth.com).
Potential clinical uses and future research
Beyond heart rate, researchers are exploring whether Wi‑Fi signals can track breathing rate and detect sleep apnea events. If successful, homes could passively gather more vital signs for overnight monitoring and early alerts. The team plans larger tests, refinements to models, and studies across more people and environments to broaden clinical value (UCSC).
Costs and hardware
A striking feature is cost. Base experiments used an ESP32 module available for about $5–$10. More advanced Raspberry Pi setups that improve reliability run near $30 — far cheaper than many medical monitors or consumer wearables. Low price may make basic monitoring practical in small clinics, farms, and rural homes.
Privacy, safety and legal questions
Pulse‑Fi raises important ethical and legal issues. Wi‑Fi heartbeat detection can be passive and invisible, which creates risk that homes, care facilities, or public places could monitor people without consent. Experts emphasize the need for rules on consent, data storage, access, and security before wide deployment (UCSC; ENN).
“Systems that read health signals from radio waves demand clear standards for consent and robust protections against hacking or unwanted surveillance.”
Real‑world limits and open questions
Pulse‑Fi is promising but early. Current work focuses mainly on heart rate. Detecting breathing, arrhythmias, or other complex conditions will require expanded testing across diverse body types, home layouts, and real living conditions. Environmental factors, multiple people in a room, and different Wi‑Fi hardware could affect accuracy; broader clinical trials are needed (UCSC).
Local angle: why Santa Cruz researchers matter
This work grew from engineering labs at the University of California, Santa Cruz, showing how regional universities can produce low‑cost tools with national impact. For rural towns and small hospitals, solutions that rely on inexpensive components could lower barriers to remote care and monitoring.
Implications for the United States
- Economic impact: Affordable devices like Pulse‑Fi could reduce home health costs and lower burdens on families and Medicaid budgets.
- Health care access: Wi‑Fi based pulse monitoring may let providers check vitals remotely and more often, helping older adults who live alone.
- Privacy and regulation: Lawmakers and regulators will need to consider HIPAA and state privacy laws for passive, in‑home monitoring.
- Infrastructure: Rural broadband quality will affect adoption; investment in internet service could enable health uses of Wi‑Fi technology.
Expert voices and sources
Primary reporting and source material include:
- University of California, Santa Cruz press release on Pulse‑Fi
- Tom’s Hardware explanation and hardware details
- Earth.com coverage of research and applications
- ENN summary of peer‑reviewed work and conference presentation
- Additional reporting and examples
What comes next
Researchers plan larger tests, work on tracking breathing, and study real home conditions. Policymakers, clinicians, and communities must weigh practical benefits against privacy and security risks. For many Americans — especially those in rural and conservative communities who value independence and low cost — Pulse‑Fi could be a useful tool if developed with clear rules and local input.
