#define TRIGGER_PIN 19
#define ECHO_PIN 18

void setup(){
  Serial.begin(115200);
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop(){
  long duration;
  float distance;

  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);

  distance = (duration * 0.0343) / 2;

  Serial.print("Distancia: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(1000);
}