A. S. Arafat, A. Yuliati, and R. Y. Manova M, “Design of a Soil Nutrient Measuring Device for NPK (Nitrogen, Phosphorus, Potassium) Case Study of Cayenne Pepper Based on Arduino Nano V3 ATmega328P”, itej, vol. 8, no. 2, pp. 57 - 62, Dec. 2023.