Open platform Wearables for vital data sit on the ear and not on the wrist

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With OpenEarable 2.0, the Karlsruhe Institute of Technology (KIT) presents a powerful open-source platform for ear-based sensors. The system, developed for research, medicine, industry, and everyday applications, combines more than 30 measurement parameters in a wireless in-ear form factor. This offers more control.

Wearables have been among the most dynamic areas of development in electronics for years. From fitness trackers to smart insulin pumps, they have become integrated into everyday life and medical care. The central challenge remains the reliable capture of biophysiological parameters under everyday conditions—while ensuring high user acceptance and energy efficiency.

Wearables like smartwatches and fitness trackers are established in the consumer market—however, their functionality is mostly limited to proprietary systems. On the research side, there is a growing need for open, expandable platforms that allow for precise acquisition of physiological data and can be flexibly configured for specific use cases.

More than 30 parameters can be recorded

With OpenEarable 2.0, researchers at KIT have developed a fully open platform for ear-wearables. The system integrates a variety of miniaturized sensors directly into wireless earbuds and allows for individual customization by developers through open hardware and software interfaces. Unlike many commercial developments, OpenEarable can be programmatically controlled to specifically test new algorithms, applications, or signal processing routines.

The platform combines multimodal sensors for biophysiological and contextual measurement parameters:

• Acoustic sensors: Microphones for detecting vibrations in the skull bone (e.g., for eating behavior or speech in noisy environments).

• Motion sensors: Inertial sensors detect movements, classify activities, and detect a fall.

• Bio sensors: Sensors for oxygen saturation, body temperature, breathing patterns, and heart rate.

• Connectivity: Energy-efficient Bluetooth LE audio for data transmission and real-time feedback via app and web dashboard.

The ear as a sensor position offers good blood flow and stable signals, and it also allows measurements that are more difficult to realize at other body locations. Especially in the combination of sensors, a wide range of applications arises—from vital parameter analysis to condition monitoring in safety-critical environments.

From research to application

The platform was developed under the leadership of Dr. Tobias Röddiger at the TECO lab of KIT and has already been validated in several studies. In doing so, OpenEarable 2.0 demonstrated high measurement accuracy compared to established reference systems. Due to its modular architecture, the system is suitable for:

• Medical diagnostics and telemonitoring,

• Fatigue detection and safety applications in industrial environments,

• Sports analytics and performance diagnostics with in-ear measurement and

• Research and development of new wearable concepts.

"We wanted to create an open, high-precision solution that goes far beyond the capabilities of commercial systems," explains Röddiger. "With OpenEarable, developers get a powerful foundation that can be tailored to individual requirements—an important step towards real high-tech wearables with medical benefits." (heh)

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