#define ldr A0
#define LED 10
int data,y;
#include <LiquidCrystal_I2C.h> :
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
   pinMode(LED, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
lcd.clear();
  data=analogRead(ldr); 
  lcd.setCursor(5,0);
  lcd.print(data);
  y = map(data,0,1023,0,255);
  analogWrite(LED,y);
delay(500);

}