int t_p = 5;
int e_p = 18;
int buzzerPin = 2; // Connect the buzzer to digital pin 8
float ss = 0.034;

long durn;
float dist_cm;
unsigned long objectDetectionStartTime = 0;  // To track the start time of object detection
bool objectDetected = false;

void setup() {
  Serial.begin(115200);
  pinMode(t_p, OUTPUT);
  pinMode(e_p, INPUT);
  pinMode(buzzerPin, OUTPUT); // Set the buzzer pin as an output
}

void loop() {
  digitalWrite(t_p, LOW);
  delayMicroseconds(2);
  digitalWrite(t_p, HIGH);
  delayMicroseconds(10);
  digitalWrite(t_p, LOW);
  durn = pulseIn(e_p, HIGH);
  dist_cm = durn * ss / 2;

  // Check if an object is detected
  if (dist_cm < 10.0) {  // Adjust the distance threshold as needed
    if (!objectDetected) {
      objectDetected = true;
      objectDetectionStartTime = millis();  // Start tracking the time
    } else {
      unsigned long currentTime = millis();
      if (currentTime - objectDetectionStartTime >= 5000) {  // 5000 milliseconds = 5 seconds
        Serial.println("Hello");  // Print "Hello" if object detected for more than 5 seconds
        digitalWrite(buzzerPin, HIGH); // Turn on the buzzer
      }
    }
  } else {
    objectDetected = false;  // Reset the object detection flag when no object is detected
    digitalWrite(buzzerPin, LOW); // Turn off the buzzer
  }

  delay(1000); // this speeds up the simulation
}