Pratama, H., Yunan, A. and Arif Candra, R. (2021) “Design and Build a Soil Nutrient Measurement Tool for Citrus Plants Using NPK Soil Sensors Based on the Internet of Things”, Brilliance: Research of Artificial Intelligence, 1(2), pp. 67-74. doi: 10.47709/brilliance.v1i2.1300.