Haidar Ali, Renaldi Dwi Saputra, Nandang Mufti, Siti Zulaikah, Muladi Muladi
This real-time water quality monitoring system is a system development concept to support the 4.0 industrial revolution. This monitoring system is based on IoT which is integrated with the Node-RED platform so that it can be monitored in real-time. This study aims to create a real-time monitoring system, display monitoring results using the Node-RED platform, calibrate the device, and validate the device with standard laboratory tools. The main components used are microcontroller NodeMCU ESP32, DS18B20 temperature sensor, pH4502C sensor, and Gravity Sensor TDS Meter. This research begins with building a hardware and software system, then the output value will be displayed on the Node-RED platform. The calibration results on the pH sensor are read in the form of voltage. At a voltage of 0.97 V produces a pH of 4.11, a voltage of 1.46 V produces a pH of 6.21 and at a voltage of 2.40 V produces a pH of 10.25. Temperature sensor validation produces the highest error with 1.92% and the lowest error reaches 0.01%. The pH sensor gets the highest error value of 1.72% and the lowest is 0.07%. In the validation of the TDS sensor, the lowest error value is 0.15%, while the highest reached 0.99%. © 2025 American Institute of Physics Inc.. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia; Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia; Center of Advanced Materials for Renewable Energy (CAMRY), Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia
