#include <LiquidCrystal_I2C.h>
#define ECHO_PIN 2
#define TRIG_PIN 3
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  pinMode(13, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  lcd.setCursor(0, 0);
  Serial.print("Jarak: ");
  Serial.println(distance);
  if(300>distance && distance>200){
    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);
  }
  else if(200>distance){
    lcd.setCursor(4, 1);
    lcd.print(("tabrak"));
    digitalWrite(13, HIGH);
    delay(50);
    digitalWrite(13, LOW);
    delay(50);
  }
  else{
    digitalWrite(13, LOW);
  }
  delay(100);
}