#include <NewPing.h>

int TRIGGER_PIN = 9;
int ECHO_PIN = 8;
int MAX_DISTANCE = 500;
int dist = 0;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_SENSOR_DISTANCE);

void setup() {
    Serial.begin(9600);// put your setup code here, to run once:

}

void loop() {
  dist = sonar.ping_cm(500);
  Serial.print(dist);
  Serial.println(" cm");
  delay(100);
}