#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int level;
#define ldr 35
#define relay 2

void setup() 
{
lcd.init();
lcd.backlight();
lcd.print("lDR = ");
pinMode(relay, OUTPUT);
Serial.begin(9600);
}

void loop() 
{
level= analogRead(ldr);
if (level<2000)
{
  digitalWrite( relay, HIGH);
  Serial.println(" Turning ON Relay");
  lcd.setCursor(0 , 1);
  lcd.println("Dark room");
}
else 
{
    digitalWrite( relay, LOW);
    Serial.println(" Turning OFF Relay");
    lcd.setCursor(0 , 1);
    lcd.println("Light room");
}
delay(1000);

lcd.setCursor(6 , 0);
lcd.println(level);

Serial.print("light level: ");
Serial.print(level);
}