#include <NewPing.h>//include Library for ultrasonic sensor
int triggerPin = 4;
#define EchoPin 3
#define maxDistance 400// detect object upto 400cm
NewPing varName(triggerPin, EchoPin, maxDistance);
//libraryName varName(pin no. or name of the pin no.)


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

void loop() {
  // put your main code here, to run repeatedly:
    delay(300);
    unsigned int dist = varName.ping_cm();
    //ping_cm() is the library function of NewPing library

    Serial.print(dist);
    Serial.println("cm");
  
}