int ldr_val = 0; //setting
int led_w = 9;    // pin 9 is set to LED white
int led_r = 10;   // pin 10 is set to LED Red, Emergency
int led_b = 13;   //


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led_w,OUTPUT); //LED White
  pinMode(led_r,OUTPUT); // LED Red, emergency

}

void loop() {
  // put your main code here, to run repeatedly:
  ldr_val = analogRead(A0);  //the value is read by analog at A0
 // Serial.println("LDR value is"); // The value read by A0 will print at the screen
  Serial.println(ldr_val); //The value read by A0 will print at the screen

  //condition of environment
  if (ldr_val<500)
  {
    digitalWrite (led_w,HIGH); //display white
    delay(5000);
  }

  else
  {
    digitalWrite(led_w,LOW); //none
    delay; //
  }


}