// Define the pins for the ultrasonic sensor
const int pinTrig = 26;
const int pinEcho = 27;

void setup() {
  // Start serial communication
  Serial.begin(9600);
  // Configure the pins for the ultrasonic sensor
  pinMode(pinTrig, OUTPUT);
  pinMode(pinEcho, INPUT);
}

void loop() {
  // Send a short pulse to the TRIG pin
  digitalWrite(pinTrig, LOW);
  delayMicroseconds(2);
  digitalWrite(pinTrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pinTrig, LOW);
  
  // Read the response time from the ECHO pin
  long duration = pulseIn(pinEcho, HIGH);
  
  // Calculate the distance in centimeters
  int distance_cm = duration * 0.034 / 2;
  
  // Print the distance on the serial port
  Serial.print("Distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");
  
  // Wait for a brief period of time before the next reading
  delay(1000);
}