#include <NewPing.h>
	
		  // Definition of pins and maximum distance
		  #define TRIGGER_PIN  D9  
		  #define ECHO_PIN     D10  
		  #define MAX_DISTANCE 200 
	
		  NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); 
	
		  void setup() {
			Serial.begin(115200); 
		  }
	
		  void loop() {
			delay(100); 
			unsigned int distance = sonar.ping_cm(); 
		  
			if (distance == 0) {
			  Serial.println("Out of range"); 
			} else {
			  Serial.print("Distance: ");
			  Serial.print(distance);
			  Serial.println(" cm"); 
			}
		  }