#define Solenoid 12
#define ldr 8
int Buzzer = 4;
int GreenLed = 6;
int RedLed = 11;
int val;
int val2;
String duration;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(ldr, INPUT_PULLUP);
  pinMode(Solenoid, OUTPUT);
  pinMode(GreenLed, OUTPUT);
  pinMode(RedLed, OUTPUT);
  digitalWrite(RedLed, HIGH);
}

  void OpenDoor(){             //Lock opening function open for 3s
 
  digitalWrite(Solenoid,HIGH);
  tone(Buzzer, 500);
  digitalWrite(RedLed, LOW);
  digitalWrite(GreenLed, HIGH);
  
  delay(3000);
  digitalWrite(Solenoid,LOW);
  noTone(Buzzer);
  digitalWrite(RedLed, HIGH);
  digitalWrite(GreenLed, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  int val = digitalRead(ldr);
  while(val == 0)
  {
    int val2 = digitalRead(ldr);
    duration += val2;
 
    if(duration == "0001")
    {

      OpenDoor();
    }
  
    if(val2 == 1)
    {
      duration = "";
      break;
    }


    delay(200);
  }

}