#define LED_pin 13
#define LDR_pin A0
 int LDR_value;

void setup() {
  Serial.begin(9600);
  pinMode(LDR_pin, INPUT);
  pinMode(LED_pin, OUTPUT);

}

void loop() {
  LDR_value=analogRead(LDR_pin);

 if(LDR_value<200)
 {
  digitalWrite(LED_pin, LOW);
  Serial.println("It's Bright");
 }
 else
 {
  digitalWrite(LED_pin, HIGH);
  Serial.println(("It's Dark "));
 }
}