#define LDR A0
#define LED 10
int data;

void setup()
{
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  data = analogRead(LDR);
  Serial.print("LDR Sensor Data: ");
  Serial.println(data);
  if(data < 900)
  digitalWrite( LED, 1);
  else
  digitalWrite(LED , 0);
  delay(1000);
}