const int trigPin = 5;  // GPIO pin connected to Trig pin of HC-SR04
const int echoPin = 18; // GPIO pin connected to Echo pin of HC-SR04
void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}
void loop() {
  // Send a 10 microsecond pulse to trigger the sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the duration of the echo pulse
  long duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  long distance = duration * 0.034 / 2;
  
  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(1000); // Wait for a second before the next reading
}