#include <NewPing.h>

#define PING_PIN 12
#define ECHO_PIN 11
#define MAX_DISTANCE 200

NewPing sonar(PING_PIN, ECHO_PIN, MAX_DISTANCE);

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

void loop(){
  delay(50);
  Serial.print("Ping");
  Serial.print(sonar.ping_cm());
  Serial.println("cm");
}