int ldr_val = 0;      // variable to store the ldr sensor status (value)
int pir_value = 0;    // variable to store the motion sensor status (value)

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;   // pin 13 is set to LED Blue, to detect the motion sensor is working or not

int motion = 2;    // pin 2 is set to Motion sensor 
int button = 7;  //pin7, button
int buzzer = 4;  //pin4, buzzer

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led_w,OUTPUT); //LED White , ldr , output
  pinMode(led_r,OUTPUT); // LED Red, emergency , output
  pinMode(led_b,OUTPUT); // LED blue ,motion , output
  pinMode(motion,INPUT); // motion , input
  pinMode(button,INPUT); // buton, input
  //pinMode(led_b,LOW); //motion , led blue
}

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_val); //The value read by A0 will print at the screen

  //condition of environment
  if (ldr_val<500)
  {
    pir_value = digitalRead(motion);

    if (pir_value == HIGH) {
      
      digitalWrite (led_b,HIGH);   // motion, turn on led blue
      delay(2000);
      digitalWrite (led_w,HIGH);   // ldr, turn on LED white
      delay(5000);    

    }
  }

  else
  {
    digitalWrite(led_b,LOW); // turn off LED blue
    delay; 
    digitalWrite(led_w,LOW); //led white
    delay; 
  }

// emergency button
if (digitalRead(button) == HIGH) { //when button is pressed
    digitalWrite(led_r,HIGH); //turn on led red
    digitalWrite(buzzer,HIGH); // turn o the buzzer
    delay(1000); //turn on led red for 5 seconds
   
  }

  else {
    digitalWrite(led_r,LOW); // turn off led red
    digitalWrite(buzzer,LOW); // turn off buzzer
    delay;

  }
}