LoRa-Based Telemetering Node for Current and Voltage Monitoring of Street Lighting Poles

Public lighting infrastructures are increasingly managed through condition-based maintenance. This paper proposes a low-cost retrofit node to telemeter electrical quantities at each illumination pole, allowing the operator to verify the operational state of lamps and feeders and to detect anomalies (e.g., open circuits, overloads, intermittent faults). The sensing front-end uses a non-invasive split-core current transformer (SCT-013-000) for mains current acquisition and an isolated voltage front-end for RMS voltage estimation. The node is built around the RAK3172 LoRa® module, operated in LoRa point-to-point mode to support multi-hop forwarding among poles (mesh-like topology) in areas where a direct gateway link is not guaranteed. To improve robustness, measurements are time-stamped and stored locally when connectivity is unavailable, then forwarded when the link is restored. Metrological aspects (traceability, uncertainty contributors, and calibration strategy) are discussed.