// Water Quality Monitoring in Aquaculture 
const int pHSensorPin = A0; // Analog pin connected to the pH sensor
const int turbiditySensorPin = A1; // Analog pin connected to the turbidity sensor
const int trigPin = 2; // Ultrasonic sensor's trig pin connected to digital pin 2
const int echoPin = 3; // Ultrasonic sensor's echo pin connected to digital pin 3

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int sensorValue_pH = analogRead(pHSensorPin); // Read pH sensor analog value
  float voltage_pH = sensorValue_pH * (5.0 / 1023.0); // Convert analog value to voltage for pH

  int sensorValue_turbidity = analogRead(turbiditySensorPin); // Read turbidity sensor analog value

  // Ultrasonic sensor to determine water level
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;

  // Check turbidity value, pH value, and water level to determine water condition
  if (sensorValue_turbidity > 500 || voltage_pH < 1.8 || voltage_pH > 3.0) {
    // If turbidity is high or pH is outside the safe range
    Serial.println("Water condition: Not clean");

    // Check pH level to determine acidity, neutrality, or alkalinity
    if (voltage_pH < 1.8) {
      Serial.println("Water pH is acidic");
    } else if (voltage_pH > 3.0) {
      Serial.println("Water pH is alkaline");
    } else {
      Serial.println("Water pH is neutral");
    }

    // Add code here for the filtering process or any actions for not clean water
  } else {
    // If turbidity is low and pH is within safe range
    Serial.println("Water is clean");
  }

  // Determine water level based on ultrasonic sensor reading
  if (distance >= 30) {
    Serial.println("Water level: Full");
  } else if (distance < 30 && distance > 10) {
    Serial.println("Water level: Normal");
  } else {
    Serial.println("Water level: Too low");
  }

  delay(500); // Delay for readability, adjust as needed
}