#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Servo.h>
#define buzer A3
#define sensor A2

Servo myservo;  
LiquidCrystal_I2C lcd(0x3f, 16, 2);

void setup() { 
  Serial.begin(9600);
  Wire.begin();
  Wire.beginTransmission(0x3F);
  if (Wire.endTransmission())
  {
    lcd = LiquidCrystal_I2C(0x27, 16, 2);
  }
lcd.init(); // klw error ganti lcd.begin
lcd.backlight();
pinMode(buzer,OUTPUT);
myservo.attach(5);
digitalWrite(buzer,HIGH);
delay(100);
digitalWrite(buzer,LOW);
delay(100);
digitalWrite(buzer,HIGH);
delay(100);
digitalWrite(buzer,LOW);
delay(100);
   myservo.write(0);
}
void loop() 
{ 
   int  ldr=analogRead(sensor);
    Serial.println (ldr); 
    float voltage =ldr * (5.0/1023.0);
    //lcd.setCursor(0,0); lcd.print("Volt =");lcd.print(voltage);lcd.print(" ");
    lcd.setCursor(0,0); lcd.print("ADC=");lcd.print(ldr);lcd.print(" ");
    delay(1000);


    int tes = map(ldr, 0, 1023, 0, 180);
    //lcd.setCursor(0,0);lcd.print(tes);lcd.print(" ");
    myservo.write(tes);
 if(ldr<=300)
 {   
   lcd.setCursor(8,0);lcd.print("Gelap  ");
   lcd.setCursor(0,1);lcd.print("Jendela Tertutup");          
   delay(100);
   
 }
  else  {lcd.setCursor(8,0);lcd.print("Terang");
       lcd.setCursor(0,1);lcd.print("Jendela Terbuka ");

       delay(100);
         
 } 

}