#define TRIG_PIN 5
#define ECHO_PIN 18

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration=pulseIn(ECHO_PIN, HIGH);
  float distance=duration*0.0343/2;

  Serial.print("DISTANCE:  ");
  Serial.print(distance);
  Serial.println(" cm");
  
  delay(500);

}