#include <HCSR04.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Pins of HC-Sc04 sensor
const int trigPin = 2;
const int echoPin = 3;



// initialization of the sensor with the pins
UltraSonicDistanceSensor distanceSensor(trigPin, echoPin);
void setup() {

pinMode (13, OUTPUT);

lcd.init();
}
void loop() {
lcd.backlight();
lcd.clear();
lcd.print("distance = ");
lcd.setCursor(0,1);
lcd.print(distanceSensor.measureDistanceCm());
lcd.print(" cm");
delay(1000);

if (distanceSensor.measureDistanceCm()<150){
  digitalWrite(13, HIGH);
}

else{
  digitalWrite(13, LOW);
}

}