On-Demand Sensor Node Wake-Up Using Solar Panels and Visible Light Communication

Area of Science:

• Electrical Engineering
• Computer Science
• Wireless Communication

Background:

• Wireless sensor nodes (WSNs) consume significant energy in standby mode.
• Existing wake-up systems often rely on radio frequency (RF) technologies.
• There is a need for energy-efficient solutions to prolong WSN operational life.

Purpose of the Study:

• To propose and evaluate a novel on-demand wake-up system for wireless sensor nodes.
• To develop the first visible light communication (VLC)-based wake-up system.
• To reduce or eliminate energy waste from WSN standby modes.

Main Methods:

• Development of a VLC-based wake-up system utilizing off-the-shelf indoor solar panels.
• Integration of energy harvesting capabilities within the wake-up receiver.
• Experimental evaluation including flickering characterization and wake-up range assessment.

Main Results:

• The developed system effectively wakes up wireless sensor nodes using visible light signals.
• The integrated solar panel successfully harvests enough energy for autonomous operation.
• Reasonable wake-up distances were achieved in indoor environments suitable for VLC.

Conclusions:

• The VLC-based wake-up system offers a viable alternative to RF-based solutions for energy saving in WSNs.
• The system extends VLC applications and enables new areas like VLC tags.
• This approach is particularly effective in indoor settings where VLC is prevalent.