int TRIG = 13;
 int ECHO = 12;

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

}

void loop()
 {
 digitalWrite(TRIG, HIGH);
 delayMicroseconds(10);
 digitalWrite(TRIG, LOW);
 int duracao = pulseIn(ECHO, HIGH);

 Serial.print("Distancia em CM  ");
 Serial.println(duracao/58);
 delay(1000);



}