#define ECHO 9
#define TRIG 10


void setup() {
  pinMode(ECHO, INPUT);
  pinMode(TRIG, OUTPUT);
  Serial.begin(9600);
}

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

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

  long duracao = pulseIn(ECHO, HIGH);

  long distancia = duracao * 0.034 /2;

  Serial.print("Distância: ");
  Serial.print(distancia);
  Serial.println("cm");

  delay(250);
}