#include <LiquidCrystal_I2C.h> :
LiquidCrystal_I2C lcddr(0x27,16,2);
#define LDR A0
#define LED 10
void setup() {
  lcddr.init();
  lcddr.backlight();
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int data = analogRead(LDR);
  lcddr.setCursor(1,0);
  lcddr.print(data);
  if (data < 900 )
   digitalWrite(LED,HIGH);
  else
   digitalWrite(LED , LOW);
  delay(1000);
}