int LDRsensor = A6;
int LED = 9;
void setup()
{
  Serial.begin(9600);
  pinMode(LDRsensor, INPUT);
}

void loop()
{
  int sensor_value = analogRead(LDRsensor);
  Serial.print("Voltage : ");
  Serial.println(sensor_value);
  if(LDRsensor > 500)
  {
    digitalWrite(LED, HIGH);
  }
  else
  {
    digitalWrite(LED, LOW);
  }
  delay(1000);
}