Manalu, Istas Pratomo. “LoRa-Based IoT Device for Water Quality Monitoring (Case Study: Lake Toba)”. Piston: Journal of Technical Engineering 7, no. 2 (January 16, 2024): 75–81. Accessed July 31, 2024. https://openjournal.unpam.ac.id/index.php/Piston/article/view/35854.