int ldr_sensor = 35;
int led = 2;

void setup(){
  Serial.begin(9600);
  analogSetAttenuation(ADC_11db);
  pinMode(led, OUTPUT);
}

void loop(){
  int ldrvalue = analogRead(ldr_sensor);

  Serial.print("Ldr Value = ");
  Serial.print(ldrvalue);

  if (ldrvalue < 40){
    Serial.println("=> Very Bright");
    digitalWrite(led, LOW);
  } else if (ldrvalue < 800){
    Serial.println("=> Bright");
    digitalWrite(led, LOW);
  } else if (ldrvalue < 2000){
    Serial.println("=> Light");
    digitalWrite(led, LOW);
  } else if (ldrvalue < 3200){
    Serial.println("=> Dim");
    digitalWrite(led, HIGH);
  } else {
    Serial.println("=> Dark");
    digitalWrite(led, HIGH);
  }
  delay(500);
}