int trig = 5;
int echo = 18;
int led = 2;

long duracao;
float distancia;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led, OUTPUT);

  Serial.begin(115200);
}

void loop() {

  
  digitalWrite(trig, LOW);
  delayMicroseconds(2);

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

  
  duracao = pulseIn(echo, HIGH);

  
  distancia = duracao * 0.034 / 2;

  Serial.println(distancia);

  if (distancia <= 6) {
    digitalWrite(led, LOW);
  } else {
    digitalWrite(led, HIGH);
  }

  delay(200);
}