#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int LDR = A0;
const int lampu = 8;

void setup() {
  pinMode(lampu, OUTPUT);
  lcd.begin(16, 2);
}

void loop() {
  int nilaiLDR = analogRead(LDR);

  int lux = map(nilaiLDR, 0, 1023, 0, 1000);
  lux = constrain(lux, 0, 1000);

  lcd.clear();

  if (lux < 100) {
    digitalWrite(lampu, HIGH);

    lcd.setCursor(0, 0);
    lcd.print("Ruang: Gelap");
  } else {
    digitalWrite(lampu, LOW);

    lcd.setCursor(0, 0);
    lcd.print("Ruang: Terang");
  }

  lcd.setCursor(0, 1);
  lcd.print("Cahaya: ");
  lcd.print(lux);
  lcd.print(" lux");

  delay(500);
}