#define P1 34
#define P2 35
#define P3 32
#define P4 33

#define LED1 14
#define LED2 27
#define LED3 26

#define BUZZER 13

int threshold = 300;

void setup() {

  Serial.begin(115200);

  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);

  pinMode(BUZZER, OUTPUT);
}

void loop() {

  int s1 = analogRead(P1);
  int s2 = analogRead(P2);
  int s3 = analogRead(P3);
  int s4 = analogRead(P4);

  Serial.print("P1: ");
  Serial.print(s1);

  Serial.print(" | P2: ");
  Serial.print(s2);

  Serial.print(" | P3: ");
  Serial.print(s3);

  Serial.print(" | P4: ");
  Serial.println(s4);

  bool leak = false;

  // Zone 1 → Between Sensor1 and Sensor2
  if(abs(s1 - s2) > threshold) {

    digitalWrite(LED1, HIGH);

    Serial.println("Leakage Between Zone 1 and Zone 2");

    leak = true;

  } else {

    digitalWrite(LED1, LOW);
  }

  // Zone 2 → Between Sensor2 and Sensor3
  if(abs(s2 - s3) > threshold) {

    digitalWrite(LED2, HIGH);

    Serial.println("Leakage Between Zone 2 and Zone 3");

    leak = true;

  } else {

    digitalWrite(LED2, LOW);
  }

  // Zone 3 → Between Sensor3 and Sensor4
  if(abs(s3 - s4) > threshold) {

    digitalWrite(LED3, HIGH);

    Serial.println("Leakage Between Zone 3 and Zone 4");

    leak = true;

  } else {

    digitalWrite(LED3, LOW);
  }

  // Buzzer Logic
  if(leak) {

    tone(BUZZER, 1000);

  } else {

    noTone(BUZZER);
  }

  delay(500);
}