Introduction

Water is a vital natural resource, and maintaining its quality is essential for human health, agriculture, and aquatic life. A Water Quality Monitoring System uses sensors and IoT technology to continuously monitor water parameters such as pH, turbidity, temperature, and water level, and sends the data to a cloud platform for real-time analysis.

This system helps detect water pollution early and ensures safe water usage.

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Objective of the Project

• To monitor water quality parameters in real time
• To detect water contamination
• To display and store data on the cloud
• To ensure safe drinking and industrial water usage

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Parameters Monitored

• pH Level – Acidity or alkalinity of water
• Turbidity – Water clarity
• Temperature – Water temperature
• Water Level – Quantity of water

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Working Principle

1. Sensors continuously sense water parameters
2. Data is sent to a microcontroller (ESP32 / Arduino)
3. Values are displayed on LCD / Serial Monitor
4. Data is uploaded to a cloud platform using Wi-Fi
5. Alerts can be generated if values cross safe limits

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Components Required

• ESP32 / Arduino Uno
• pH Sensor
• Turbidity Sensor
• DS18B20 Temperature Sensor
• Water Level Sensor
• LCD / OLED Display
• Wi-Fi Module (ESP8266 if using Arduino)
• Jumper Wires
• Power Supply

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Block Diagram

Water Sensors
(pH, Turbidity, Temp)
        ↓
   ESP32 / Arduino
        ↓
 LCD Display + Serial
        ↓
     Wi-Fi Module
        ↓
    Cloud Platform

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Circuit Connections (ESP32 Example)

Sensor Connections

pH Sensor        → GPIO34 (Analog)
Turbidity Sensor→ GPIO35 (Analog)
Temperature     → GPIO4
Water Level     → GPIO32 (Analog)
LCD SDA         → GPIO21
LCD SCL         → GPIO22

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Arduino / ESP32 Code

#include <WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "ThingSpeak.h"

#define PH_PIN 34
#define TURBIDITY_PIN 35
#define LEVEL_PIN 32
#define ONE_WIRE_BUS 4

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const char* ssid = "Your_WiFi";
const char* password = "Your_Password";
WiFiClient client;

unsigned long channelID = 123456;
const char* writeAPIKey = "YOUR_API_KEY";

void setup() {
  Serial.begin(9600);
  sensors.begin();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  ThingSpeak.begin(client);
}

void loop() {
  int phValue = analogRead(PH_PIN);
  int turbidity = analogRead(TURBIDITY_PIN);
  int waterLevel = analogRead(LEVEL_PIN);

  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);

  Serial.println("pH: " + String(phValue));
  Serial.println("Turbidity: " + String(turbidity));
  Serial.println("Water Level: " + String(waterLevel));
  Serial.println("Temperature: " + String(temperature));

  ThingSpeak.setField(1, phValue);
  ThingSpeak.setField(2, turbidity);
  ThingSpeak.setField(3, temperature);
  ThingSpeak.setField(4, waterLevel);
  ThingSpeak.writeFields(channelID, writeAPIKey);

  delay(15000);
}

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Code Explanation

• Sensors collect water quality data
• ESP32 reads analog and digital values
• Data is sent to ThingSpeak cloud
• Continuous monitoring every 15 seconds

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Advantages

• Real-time water quality monitoring
• Early detection of pollution
• Low maintenance system
• Cloud-based data access

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Applications

• Drinking water monitoring
• Industrial water quality control
• River and lake monitoring
• Smart agriculture and irrigation

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Future Enhancements

• AI-based water quality prediction
• Mobile app alerts
• Automatic water purification control
• GPS-based location tracking

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Conclusion

The Water Quality Monitoring System is an effective IoT-based solution to ensure safe and clean water. By continuously monitoring critical parameters and storing data on the cloud, it helps authorities and users make informed decisions for water safety.