#define LED1 19
#define LED2 18
#define LED3 5
#define LED4 17
#define ldr 32 
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");
  if(lux < 100){
    Serial.print("Turn off "); 
    digitalWrite(LED3, LOW);
    Serial.print("Turn on ");
      digitalWrite(LED4, HIGH);
  }
 else if (lux >= 100){
    Serial.print("Turn on "); 
      digitalWrite(LED3, HIGH);
 Serial.print("Turn off "); 
    digitalWrite(LED4, LOW);
    for(int i = 0; i < 3; i++){
   digitalWrite(LED1, LOW); 
   delay(500);   
   digitalWrite(LED1, HIGH);
    delay(500); }
    digitalWrite(LED1, LOW); 
  }
  
}