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P-N junction01:11

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Self-Sufficient Sensor Node Embedding 2D Visible Light Positioning through a Solar Cell Module.

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Summary
This summary is machine-generated.

This study introduces a low-power indoor positioning system using visible light and LoRaWAN. It achieves accurate 2D positioning with self-sufficient energy harvesting from ambient light.

Keywords:
IoTLoRaWANenergy harvestingindoor positioninglow powerphotovoltaicultra-low powervisible light positioning

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Area of Science:

  • Internet of Things (IoT)
  • Indoor Positioning Systems (IPS)
  • Wireless Sensor Networks

Background:

  • Indoor positioning is crucial for IoT applications like Industry 4.0, Smart Cities, and Smart Factories.
  • Existing systems often face challenges with power consumption and infrastructure requirements.
  • Tracking assets, people, and vehicles indoors demands precise and efficient localization technologies.

Purpose of the Study:

  • To develop and test a low-power sensor node for 2D Visible Light Positioning (VLP).
  • To integrate Long Range Wide Area Network (LoRaWAN) for data transmission.
  • To achieve energy self-sufficiency for the indoor localization node.

Main Methods:

  • Utilized three modulated LED light sources for VLP.
  • Implemented optical channel estimation and lateration on a low-power microcontroller.
  • Integrated a solar cell for simultaneous optical reception and energy harvesting.

Main Results:

  • Achieved accurate 2D positioning with errors below 5 cm in a 1m² area.
  • Demonstrated energy self-sufficiency, even with radio transmissions every 10 minutes.
  • Validated the system's suitability for quasi-real-time monitoring tasks.

Conclusions:

  • The developed VLP system offers a highly accurate and energy-efficient solution for indoor localization.
  • The integration of LoRaWAN and solar energy harvesting enables self-sufficient operation.
  • This innovative approach addresses key challenges in IoT-based indoor tracking and monitoring.