#define TRIG_PIN_1 2
#define ECHO_PIN_1 1
#define TRIG_PIN_2 7
#define ECHO_PIN_2 0
#define TRIG_PIN_3 29
#define ECHO_PIN_3 6
#define RELAY_PIN_1 27
#define RELAY_PIN_2 26
#define RELAY_PIN_3 28
#define MIN_ACTIVATION_DISTANCE_1 10 // Minimum distance to activate pump 1 (in cm)
#define MIN_ACTIVATION_DISTANCE_2 15 // Minimum distance to activate pump 2 (in cm)
#define MIN_ACTIVATION_DISTANCE_3 20 // Minimum distance to activate pump 3 (in cm)
#define PUMP_ACTIVATION_TIME 4000 // Pump activation time (in milliseconds)
#define TIME_BETWEEN_MEASUREMENTS 60000 // Time between measurements (in milliseconds)

unsigned long last_measurement_time = 0;

void setup() {
  Serial.begin(9600);
  pinMode(TRIG_PIN_1, OUTPUT);
  pinMode(ECHO_PIN_1, INPUT);
  pinMode(TRIG_PIN_2, OUTPUT);
  pinMode(ECHO_PIN_2, INPUT);
  pinMode(TRIG_PIN_3, OUTPUT);
  pinMode(ECHO_PIN_3, INPUT);
  pinMode(RELAY_PIN_1, OUTPUT);
  pinMode(RELAY_PIN_2, OUTPUT);
  pinMode(RELAY_PIN_3, OUTPUT);
}

void loop() {
  unsigned long current_time = millis();
  
  if (current_time - last_measurement_time >= TIME_BETWEEN_MEASUREMENTS) {
    // First ultrasound reading
    long duration_1, distance_1;
    digitalWrite(TRIG_PIN_1, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN_1, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN_1, LOW);
    duration_1 = pulseIn(ECHO_PIN_1, HIGH);
    distance_1 = duration_1 * 0.034 / 2;

    // Second ultrasound reading
    long duration_2, distance_2;
    digitalWrite(TRIG_PIN_2, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN_2, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN_2, LOW);
    duration_2 = pulseIn(ECHO_PIN_2, HIGH);
    distance_2 = duration_2 * 0.034 / 2;

    // Third ultrasound reading
    long duration_3, distance_3;
    digitalWrite(TRIG_PIN_3, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN_3, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN_3, LOW);
    duration_3 = pulseIn(ECHO_PIN_3, HIGH);
    distance_3 = duration_3 * 0.034 / 2;

    // Show distances on the serial monitor
    Serial.print("Ultrasound Distance 1: ");
    Serial.print(distance_1);
    Serial.println(" cm");

    Serial.print("Ultrasound Distance 2: ");
    Serial.print(distance_2);
    Serial.println(" cm");

    Serial.print("Ultrasound Distance 3: ");
    Serial.print(distance_3);
    Serial.println(" cm");

    // Pump control
    if (distance_1 < MIN_ACTIVATION_DISTANCE_1 && distance_2 < MIN_ACTIVATION_DISTANCE_2 && distance_3 < MIN_ACTIVATION_DISTANCE_3) {
      digitalWrite(RELAY_PIN_1, HIGH); // Activate the pump
      digitalWrite(RELAY_PIN_2, HIGH); // Activate the pump
      digitalWrite(RELAY_PIN_3, HIGH); // Activate the pump
      Serial.println("Pump activated");
      delay(PUMP_ACTIVATION_TIME);
      digitalWrite(RELAY_PIN_1, LOW); // Deactivate the pump
      digitalWrite(RELAY_PIN_2, LOW); // Deactivate the pump
      digitalWrite(RELAY_PIN_3, LOW); // Deactivate the pump
      Serial.println("Pump deactivated");
    }
    
    last_measurement_time = current_time;
  }
}