const int triggerPin = 8;
const int echoPin = 9;
const int ledPin = 12;

void setup() {
  Serial.begin(9600);
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  long duration, distance_cm;
  
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance_cm = duration * 0.034 / 2;
  
  Serial.print("Distancia: ");
  Serial.print(distance_cm);
  Serial.println(" cm");
  
  if (distance_cm < 10) { // Se a distância for menor que 10 cm
    digitalWrite(ledPin, HIGH); // Acende o LED
  } else {
    digitalWrite(ledPin, LOW); // Apaga o LED
  }
  
  delay(100); // Delay entre medições
}