#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);
}