What IoT devices are starting to track your vitals without you noticing?

The environment around you is becoming an active participant in health monitoring. Beyond the smartwatch on your wrist or the fitness band you intentionally wear, a new generation of Internet of Things (IoT) hardware is beginning to measure physiological data without requiring any action on your part. This emerging field, known as passive IoT vital sign tracking, embeds sensors into everyday objects, turning them into opportunistic health screening devices. From the smart display in your living room to the kiosk at the airport, the capability to sense heart rate, respiration, and other indicators is being integrated directly into the background of daily life.

"The IoMT (Internet of Medical Things) market is forecasted to surge from $60 billion in 2024 to $814.28 billion by 2032, driven by an extraordinary CAGR of 38.5%."

• Fordewind, 2024

The technology of unseen health monitoring

The core principle of passive IoT vital sign tracking is to gather health data without interrupting a person's routine. This is achieved through sophisticated, non-contact sensors that can operate from a distance. Unlike traditional medical devices that require physical contact, these new methods use cameras, radio waves, or radar to detect subtle physiological changes. The goal is to create a persistent layer of health awareness within an environment, enabling early detection of potential issues and providing a more holistic view of well-being over time. This is a significant shift from the episodic nature of conventional health checks.

Technology	How It Works	Common Devices	Range & Limitations
rPPG (remote photoplethysmography)	A standard camera detects minute changes in light reflected off the skin, which correspond to the pulsing of blood vessels. AI algorithms analyze the video feed to extract heart rate and other vitals.	Smart Displays, Kiosks, Laptops, Mirrors	Requires good lighting and a relatively still subject. Effective range is typically a few meters.
Radar Systems	Low-power millimeter-wave radar transmits signals that bounce off a person. The system measures the tiny chest movements from breathing and the ballistic forces from the heartbeat.	Dedicated health monitors, Automotive cabins, Smart home hubs	Can work in complete darkness and through clothing. Range can extend across a small room. Less susceptible to lighting issues.
RF (Radio-Frequency) Sensing	Uses existing wireless signals like WiFi to sense motion and physiological signs. It analyzes how a person's body alters the signal path between a transmitter and receiver to detect breathing and heart rate.	WiFi Routers, Dedicated RF sensors	uses existing infrastructure. Can be impacted by other movements in the environment. Research is ongoing to improve signal separation.

Industry applications of passive sensing

The applications for passive vital sign monitoring are expanding as the technology matures and becomes more cost-effective to embed in commercial devices. The primary drivers are efficiency, safety, and the growing demand for continuous, data-rich health insights.

Public and commercial spaces

Health screening kiosks in public areas like airports, corporate lobbies, and retail clinics are prime examples of this technology in action. Using rPPG, a device can measure a person's heart rate and respiratory rate while they are interacting with the kiosk for another purpose, such as checking in or accessing information. This provides a quick, frictionless health baseline without adding extra steps for the user.

Smart homes and senior living

The home environment is a major focus for passive IoT vital sign tracking. Devices are being developed to monitor residents, especially older adults, in an unobtrusive way.

• Smart mirrors equipped with rPPG cameras can analyze a person's reflection to track wellness trends over time.
• Smart TVs and displays can use their built-in cameras to monitor the vital signs of viewers on the couch.
• Researchers are also exploring radar-based systems that can be placed in a room to monitor sleep quality, respiratory patterns, and movement, alerting caregivers to potential problems like falls or respiratory distress.

Automotive and workplace

In the automotive sector, both camera and radar-based systems are being integrated into vehicle cabins to monitor driver alertness and health. By tracking heart rate variability and eye movement, a car could detect drowsiness or a medical emergency and take action. In the workplace, office chairs with embedded sensors are being designed to track posture and stress levels through subtle physiological cues.

Current research and evidence

The scientific community is actively exploring and validating these passive sensing modalities. Research published by a team at the University of Washington (2023) demonstrated the use of existing smart speakers, which emit inaudible signals to track respiratory patterns in a room. Another significant area of development is in sensor fusion, combining data from multiple sources. For instance, a system might use both camera and radar inputs to get a more robust reading that works under a wider variety of environmental conditions. A 2022 study by researchers at the University of Toronto demonstrated a system for contactless blood pressure monitoring using a smartphone's video camera, achieving a high degree of accuracy through advanced AI models. These studies highlight the move from laboratory concepts to practical, real-world applications.

The future of embedded vitals

Looking ahead, the trend is toward multi-modal systems embedded in an even wider array of objects. Researchers are working on "smart textiles" and metamaterial-based surfaces that could turn furniture or flooring into large-scale physiological sensors. However, the widespread adoption of passive IoT vital sign tracking hinges on solving key challenges, primarily related to data privacy and security. For these systems to be trusted, manufacturers must implement robust, transparent frameworks for data handling, user consent, and security. The raw data from these sensors, especially video or radar, needs to be processed at the edge, on the device itself, to protect privacy, with only key biometric results sent to the cloud.

Frequently asked questions

What everyday devices can monitor vitals? Currently, the most common devices are smart displays, health kiosks, and some high-end smartwatches. However, technology is being embedded in developmental products like smart mirrors, TVs, and even specialized seating to enable passive monitoring.

How accurate is passive vital sign tracking? The accuracy depends on the technology, the environment, and the user's state (e.g., motion). Camera-based rPPG can be very accurate in good lighting with a still subject, while radar can be more robust in varied conditions. Research continues to improve the reliability and expand the operating conditions for these technologies.

Is this technology regulated? If a device is marketed with claims to diagnose, treat, or prevent a disease, it generally falls under the regulation of bodies like the FDA in the United States. However, many devices are positioned as "wellness" or "fitness" tools, which often exist outside of strict medical device regulations. The regulatory landscape is continuously evolving.

As the line between consumer electronics and health technology blurs, the demand for embedded, contactless vital sign monitoring will only grow. For medical device companies, kiosk manufacturers, and IoT platform providers, the challenge is no longer about whether this technology works, but how to integrate it reliably, ethically, and securely. Circadify is at the forefront of this space, providing the core engine to power next-generation devices. To learn more about integrating these capabilities into your hardware, see our Hardware Integration Guide at circadify.com/custom-builds/clinical-kiosks.