#include "SR04.h"
#include <SendOnlySoftwareSerial.h>

#define TRIG_PIN 3
#define ECHO_PIN 4

SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
SendOnlySoftwareSerial mySerial (2);  // Tx pin

long a;



void setup ()
  {
  mySerial.begin(9600);
  }



void loop ()
{
 a=sr04.Distance();
   mySerial.print(a);
   mySerial.println("cm");
   delay(1000);
   
}