my_code

#define echoPin 49 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 51 //attach pin D3 Arduino to pin Trig of HC-SR04

// defines variables
long duration; // variable for the duration of sound wave travel
float distance; // variable for the distance measurement


void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  pinMode(53, OUTPUT);
  pinMode(47, OUTPUT);
  Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed

  digitalWrite(53, HIGH); //these pins are used to provide power to the sensor.
  digitalWrite(47, LOW);

}
void loop() {
  Serial.print("Distance: ");
  Serial.print(GetDistance());
  Serial.println(" cm");
}

float GetDistance(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  return distance;
}