Introduction

This project implements a comprehensive water quality monitoring system with automated flow control for residential and municipal water management. The system measures multiple water quality parameters including pH level, Total Dissolved Solids (TDS) with temperature compensation, and water level using an ultrasonic sensor. The pH values are classified as Acidic (<6.0), Neutral (6.0–8.0), or Alkaline (>8.0), while TDS readings are categorized from ideal drinking water (0–50 ppm) through tap water to high TDS levels. An automated pump system manages water flow based on level thresholds — activating when water is low (distance >12cm) and deactivating when full (<6cm). The SIM800L GSM module sends SMS alerts on water state changes and periodic quality reports every 20 minutes.

System Overview

Aim and Objectives

Aim:
Design and develop a multi-parameter water quality monitoring system with automated pump control and GSM-based SMS alerting for water management.

Objectives:

• Measure water pH using an analog pH sensor with acidic/neutral/alkaline classification.
• Monitor Total Dissolved Solids (TDS) with DS18B20 temperature compensation for accurate readings.
• Track water level in real-time using HC-SR04 ultrasonic distance sensor.
• Automate water pump control based on level thresholds with hysteresis logic.
• Send SMS alerts on water availability state changes with quality report via SIM800L GSM.
• Provide periodic water quality SMS reports every 20 minutes for ongoing monitoring.
• Display all parameters on 20x4 LCD with per-condition status messages.

Features & Deliverables

• pH Monitoring: Analog pH sensor with classification — Acidic (<6.0), Neutral (6.0–8.0), Alkaline (>8.0).
• TDS Analysis: GravityTDS sensor with temperature-compensated readings classified from ideal drinking to high TDS.
• Water Level Tracking: HC-SR04 ultrasonic sensor mapped to 0–14cm range for tank level monitoring.
• Automated Pump Control: Relay-controlled pump with ON at low level (>12cm), OFF at full (<6cm).
• SMS Alerts: State-change notifications with quality report and periodic 20-minute reports via GSM.
• Temperature Compensation: DS18B20 waterproof sensor provides TDS temperature correction for accuracy.
• LCD Display: 20x4 LCD shows pH, TDS, temperature, water level, and pump status in real-time.
• Buzzer Alarm: Audible alert when water is unavailable (tank empty).

Process / Methodology

Hardware Assembly

Components: Arduino Mega, pH Sensor, GravityTDS Sensor, DS18B20, HC-SR04, SIM800L GSM, Relay, Water Pump, 20x4 LCD, Buzzer.

• Submerged pH and TDS sensors in water sample for continuous quality measurement.
• Mounted DS18B20 waterproof temperature probe in water for TDS compensation.
• Positioned HC-SR04 ultrasonic sensor above water tank for non-contact level measurement.
• Connected relay module to water pump for automated flow control.

Software Development

• Developed pH reading with analog calibration and three-state classification logic.
• Implemented GravityTDS library integration with DS18B20 temperature compensation.
• Programmed pump control with hysteresis thresholds to prevent rapid cycling.
• Created SMS alerting with per-condition send-once logic and periodic reporting timer.

Testing & Calibration

• Calibrated pH sensor using standard pH 4.0, 7.0, and 10.0 buffer solutions.
• Validated TDS readings against commercial TDS meter for accuracy verification.
• Tested pump control hysteresis under varying water level conditions.

Challenges & Solutions

• Challenge: pH sensor drift over time requiring periodic recalibration.
  Solution: Implemented offset-based calibration that can be adjusted in firmware without hardware changes.
• Challenge: TDS accuracy varying with water temperature.
  Solution: Integrated DS18B20 temperature sensor for real-time TDS compensation using GravityTDS library.
• Challenge: SMS module sending duplicate alerts on threshold boundary oscillation.
  Solution: Implemented per-condition send-once flags that reset only on state change.

Results & Impact

• Water Quality Insight: Multi-parameter analysis provided comprehensive water safety assessment.
• Automated Management: Pump control maintained consistent water levels without manual intervention.
• Timely Notifications: SMS alerts enabled remote awareness of water quality and availability changes.
• Periodic Reporting: 20-minute quality reports provided continuous monitoring data for analysis.

Future Enhancements

• Add turbidity sensor for visual clarity measurement and contamination detection.
• Implement WiFi connectivity with cloud dashboard for historical trend analysis.
• Add dissolved oxygen sensor for comprehensive aquatic health monitoring.
• Develop mobile app for real-time water quality visualization and alert management.

Demonstration / Access

• GitHub Repository: Coming soon
• Live Demonstration Video: Coming soon

Thank You for Visiting My Portfolio

I sincerely appreciate you taking the time to explore my portfolio and learn about my work and expertise. If you have any questions or wish to discuss potential collaborations, please feel free to reach out via the Contact section.

Best regards,
Damilare Lekan, Adekeye.