An Energy-Autonomous and Maintenance-Free Wireless Sensor Platform with LoRa Connectivity
2023 12th International Conference on Renewable Energy Research and Applications (ICRERA)(2023)
摘要
Wireless sensor nodes (WSNs) are typically powered by batteries, which results in a maintenance burden and cost, especially in Internet of Things (IoT) scenarios that install many devices. For these applications, the ideal node must be set-and-forget, maintenance-free, and low-cost. This paper proposes a self-powered wireless sensor platform, implemented through a photovoltaic cell and with LoRa connectivity. An off-the-shelf amorphous silicon photovoltaic cell of 58.1 mm
$\times 48.6$
mm is used to harvest and sense indoor ambient light with a limit of detection of 200 lux. The system embeds a 2 mF storage capacitor that every cycle stores enough energy to send a maximum of 30 bytes data packet when the LoRa transmitter is configured with a spreading factor of 7, a bandwidth of 125 KHz, and an output transmitted power of 14 dBm. Experimental measurements performed in an urban area have shown that a 20 bytes data packet is received correctly and reliably at the maximum distance of 560 m.
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关键词
Battery-less, Energy Harvesting, LoRa, Internet of Things (IoT), Wireless Sensor Network (WSN)
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