#include<EasyUltrasonic.h>
#define TRIGPIN 2
#define ECHOPIN 4

EasyUltrasonic ultrasonic;

void setup() {
Serial.begin(9600);
  pinMode(5,OUTPUT);
  ultrasonic.attach(TRIGPIN,ECHOPIN);
}

void loop() {
    float distanceIN = ultrasonic.getDistanceIN();
  float distanceCM = convertToCM(distanceIN);
  Serial.print("distance");
  Serial.println(" CM");
  if(distanceCM<=30)
  {
    digitalWrite(5, HIGH);
  }
  else
  {
    digitalWrite(5, LOW);
  }
delay(1);
}