S.E.G. Goh, “Calibration of Arduino Sensors for Soil Moisture Monitoring in Sandy Soils”, IJIE, vol. 18, no. 5, pp. 263–271, Sep. 2026, Accessed: Nov. 07, 2026. [Online]. Available: https://journal.uthm.edu.my/index.php/ijie/article/view/23276