#include <SoftwareSerial.h>

SoftwareSerial monserial(0, 1);
long distancia;
long tiempo;
int trigger=10;
int echo=9;
void setup() {
  // put your setup code here, to run once:
  monserial.begin(9600);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT); 
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigger,LOW);
  delayMicroseconds(5); 
  digitalWrite(trigger,HIGH); 
  delayMicroseconds(10);
  tiempo=pulseIn(echo,HIGH); 
  distancia= int(0.0175*tiempo); 
  monserial.println("Distance ");
  monserial.println(distancia);
  monserial.println(" cm");
  delay(500);
}