Real-Time Water Quality Monitoring System | Arduino + Node-RED + Google Sheets

Water Quality Monitoring System Using Arduino, Node-RED & Google Sheets In this project, we developed a low-cost and real-time Water Quality Monitoring System for monitoring important water quality parameters using commonly available sensors and an Arduino-based system. The developed system measures: • pH • Turbidity • Total Dissolved Solids (TDS) • Temperature The sensor outputs are processed by an Arduino-based microcontroller and experimentally calibrated to obtain suitable measurement relationships. The measured values are displayed locally using an I2C LCD and transmitted through an Internet-connected Node-RED system for real-time monitoring. The Node-RED dashboard provides numerical readings and graphical visualization of the measured parameters. The system also stores the measured data in Google Sheets, allowing continuous data logging and further analysis. In addition, a Water Quality Index (WQI) is calculated to provide an overall water quality classification: 🟢 Safe 🟡 Warning 🔴 Risky A three-color LED indication system is also implemented to provide a simple visual indication of the water quality status. For experimental evaluation, the system was tested using different water samples, including: • Acidic solution • Clean neutral water • Sandy water The experimental results demonstrated noticeable changes in pH, turbidity, and TDS between different samples, while the temperature remained relatively stable. This project demonstrates the practical implementation of a low-cost water quality monitoring system combining sensor-based measurement, Arduino processing, Node-RED visualization, Internet-based monitoring, Google Sheets data logging, WQI classification, and LED indication. Future development can include machine-learning-based water quality prediction, long-term trend analysis, improved sensor validation, portable enclosure design, and additional methods for biological water quality assessment. Project developed as an undergraduate engineering project. #WaterQualityMonitoring #Arduino #NodeRED #WaterQuality #IoT #Turbidity #pH #TDS #EngineeringProject