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 (1000);
}