#define echoPin 2
#define trigPin 4

long duration;
long distance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(trigPin, INPUT);
  Serial.begin(115200);
  Serial.println("Ultrasonic Senssor HC-SR04 Test");
  Serial.println("With ESP32");
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
}