#include "NewPing.h"

#define TRIGGER_PIN 4
#define ECHO_PIN 3
#define MAX_DISTANCE 400

NewPing sonar(TRIGGER_PIN,ECHO_PIN,MAX_DISTANCE);


void setup() {

Serial.begin (9600);

pinMode(TRIGGER_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);

}
 

void loop()
{

 digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  
long duration,distance;
duration= pulseIn(ECHO_PIN,HIGH);
  
  distance = duration/58.2;

 Serial.print(distance);
    Serial.println(" cm");
    delay(50);

  }