Flexible wearable sensor nodes with solar energy harvesting

Area of Science:

• Biomedical Engineering
• Energy Harvesting
• Wearable Technology

Background:

• Wearable sensor nodes are increasingly utilized for real-time physiological monitoring.
• These devices offer potential for promoting healthy lifestyles and preventing illness.
• Existing systems often face limitations in power supply and continuous operation.

Purpose of the Study:

• To develop a flexible wearable sensor system powered by solar energy harvesting.
• To integrate photoplethysmography (PPG) for heart rate monitoring and accelerometers for activity tracking.
• To investigate the power consumption and operational efficiency of the system.

Main Methods:

• A flexible wearable sensor system was designed and implemented.
• A solar energy harvester with an output current-based maximum power point tracking (MPPT) algorithm was employed.
• Photoplethysmography (PPG) sensors and accelerometers were integrated for physiological and activity monitoring.
• Power consumption was analyzed under various operating conditions.

Main Results:

• The developed system successfully measured heartbeats and monitored activity.
• The solar energy harvester efficiently operated the sensor nodes.
• Experimental results showed the wearable sensor nodes could operate for over 12 hours after 3 hours of solar charging in bright sunlight.

Conclusions:

• The proposed flexible wearable sensor system offers a sustainable and efficient solution for continuous physiological monitoring.
• Solar energy harvesting provides a viable power source for wearable sensor nodes, extending operational time.
• This technology has the potential to enhance personal health monitoring and preventative healthcare.