#include <LiquidCrystal_I2C.h>

const int echoPin = 3;
const int trigPin = 2;
const int pinLED = 8;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(pinLED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int durasiPantulan = pulseIn(echoPin, HIGH);
  float jarak = durasiPantulan * 0.034 / 2;

  lcd.setCursor(1, 0);
  lcd.print("Jarak = ");
  lcd.setCursor(7, 0);
  lcd.print(jarak);
  lcd.print(jarak);
  Serial.print("Jarak : ");
  lcd.print(jarak);
  Serial.println()("cm");

  delay(1000);
  if(jarak <= 250){
    digitalWrite(pinLED, HIGH);
  }
  else{
    digitalWrite(pinLED, LOW);
  }
}