#define ldr 32 
#define led1 19
#define led2 18
#define led3 5
#define led4 17
float ADC_value = 0.0048828125;

void setup() {
  Serial.begin(9600);
  pinMode(ldr, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
    //------//
    for (int i = 0; i < 3; i++){
    digitalWrite(led1, LOW);
    delay(500);
    digitalWrite(led1, HIGH);
    delay(500);
    digitalWrite(led1, LOW);
    }
  //-----//
}

void loop() {

    digitalWrite(led2, HIGH);
    delay(2000);
    digitalWrite(led2, LOW);
    delay(2000);

  float ldr_data = analogRead(ldr);
  int lux = int((250.000000/(ADC_value*ldr_data))-50.000000);

  Serial.print("Light Value = ");
  Serial.print(lux);
  Serial.println("Lux Unit");
  delay(1000);

  if(lux < 100){
    Serial.print("-----Turn off-----");
    digitalWrite(led4,HIGH);
    digitalWrite(led3,LOW);
  }
  else if (lux >= 100){
    Serial.print("*****Turn on*****");
    digitalWrite(led3,HIGH);
    digitalWrite(led4,LOW);
    
      for (int i = 0; i < 3; i++){
        digitalWrite(led1, LOW);
        delay(500);
        digitalWrite(led1, HIGH);
        delay(500);
        digitalWrite(led1, LOW);
      }
  }

}