#include <NewPing.h>
 
const int triggerPin = 6;
const int echoPin = 7;
const int maxDistance = 200;
 
NewPing sonar(triggerPin, echoPin, maxDistance);
 
void setup() {
  Serial.begin(9600);
}
 
void loop() {
  delay(100);
  Serial.print("Ping: ");
  Serial.print(sonar.ping_cm());
  Serial.println("cm");
}