Low-Cost RGB-LED photometric device for real-time dissolved oxygen and turbidity monitoring in wastewater

Benites-Rodriguez J.; Pascual-Panduro P.; Grados-Gamarra J.; Damas-Flores C.; Castro-Vidal R.; Tabacchi-Murillo J.; Ramos-Palacios W. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2026) · DOI: 10.18687/laccei2026.1.1.2369

Resumen

This research presents the design, implementation and experimental validation of a low-cost photometric device for real-time monitoring of dissolved oxygen concentration and turbidity in wastewater. The system integrates an RGB-LED illumination module with an LDR GL5528 sensor and a PIC18F4550 microcontroller. A total of 60 experimental measurements demonstrate dissolved oxygen values of 0.0052±0.0008 mg/L (Sample A, n=30) and 0.0058±0.0007 mg/L (Sample B, n=30) with average errors below 10%. The calibration curve (n=60 samples) yielded R2 = 0.9847, validating the system's accuracy.

Instituciones: Universidad Nacional Mayor de San Marcos; Universidad Nacional del Callao