const int trig = 6; // Trigger pin

const int echo = 7; // Echo pin



long totaltime;

long distance;



void setup() {

  pinMode(trig, OUTPUT);  // Set trig pin as output

  pinMode(echo, INPUT);   // Set echo pin as input

  Serial.begin(9600);     // Start serial communication at 9600 baud rate

}



void loop() {

  // Clear the trig pin by setting it LOW

  digitalWrite(trig, LOW);

  delayMicroseconds(2);



  // Trigger the sensor by setting the trig pin HIGH for 10 microseconds

  digitalWrite(trig, HIGH);

  delayMicroseconds(10);

  digitalWrite(trig, LOW);



  // Read the echo pin and calculate the time it takes for the echo to return

  totaltime = pulseIn(echo, HIGH);



  // Calculate the distance (in cm) based on the speed of sound (343 m/s)

  distance = totaltime * 0.034 / 2;



  // Print the distance to the Serial Monitor

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");



  delay(500);  // Wait for half a second before the next reading

}