#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int ldrPin = A0;
int redPin = 3;
int greenPin = 5;
int bluePin = 6;
int buzzer = 9;
int ldrValue;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(buzzer, OUTPUT);
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Lampu Pintar");
  delay(1000);
}

void loop() {
  ldrValue = analogRead(ldrPin);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Cahaya: ");
  lcd.print(ldrValue);

  if (ldrValue < 300) { // Gelap
    setColor(255, 0, 0);
    tone(buzzer, 1000);
    lcd.setCursor(0,1);
    lcd.print("Status: Gelap");
  }
  else if (ldrValue < 700) { // Normal
    setColor(0, 255, 0);
    noTone(buzzer);
    lcd.setCursor(0,1);
    lcd.print("Status: Normal");
  }
  else { // Terang
    setColor(0, 0, 255);
    tone(buzzer, 2000);
    lcd.setCursor(0,1);
    lcd.print("Status: Terang");
  }

  delay(200);
}

void setColor(int r, int g, int b) {
  analogWrite(redPin, r);
  analogWrite(greenPin, g);
  analogWrite(bluePin, b);
}