int sensorPin=A0;
int sensorValue=0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  sensorValue=analogRead(sensorPin);

  if(sensorValue<=400)
  {
    Serial.print("It's Dark , value is =");
    Serial.println(sensorValue);
  }

   else if(sensorValue>400)
  {
    Serial.print("It's Bright , value is =");
    Serial.println(sensorValue);
  }

  delay(100);
}