Design of a Soil Nutrient Measuring Device for NPK (Nitrogen, Phosphorus, Potassium) Case Study of Cayenne Pepper Based on Arduino Nano V3 ATmega328P. ITEJ [Internet]. 2023 Dec. 12 [cited 2026 Mar. 10];8(2):57-62. Available from: https://itej.uinssc.ac.id/index.php/itej/article/view/120