#define LDRPin A5
#define LED 6 
void setup()
{
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  int ADCvalue=analogRead(LDRPin);
  Serial.print("Analog value from LDR is :");
  Serial.println(ADCvalue);
  digitalWrite(LED,ADCvalue>512?HIGH:LOW);
  delay(200);
}