#include <NewPing.h>
#define TGRP 3
#define ECHP 2  
#define DISTANCE 200

NewPing sonar(TGRP, ECHP, DISTANCE);

void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(50);              
  Serial.print("Ping: ");
  Serial.print(sonar.ping_cm()); 
  Serial.println("cm");
}