Contactless Remote Liquid Level Sensing System for Tanks

This paper presents the design and implementation of an IoT-based smart water tank monitoring system utilizing ultrasonic sensing and GSM remote communication. The proposed system integrates an Arduino microcontroller with an ultrasonic sensor for accurate liquid level detection, complemented by real-time visual feedback through an LCD display. A GSM module enables remote monitoring via SMS alerts, while a dedicated Blynk-based Android application provides enhanced user interaction and data visualization capabilities. The system architecture was first validated through Proteus simulation before physical prototype implementation. Key features include automated low-level alerts (triggered at ≤25% capacity) and full-tank cutoff functionality, with dual notification mechanisms (LED indicators and mobile alerts). Experimental results demonstrate reliable performance in both local and remote monitoring scenarios. This cost-effective solution offers practical applications for residential, commercial, and industrial water management, addressing critical challenges in resource conservation and overflow prevention. The successful integration of hardware components with IoT connectivity demonstrates the potential for scalable deployment in various environmental conditions.