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Arduino Door Lock with Smartphone Flashlight Login (Li-Fi project)

 Arduino Door Lock with Smartphone Flashlight Login (Li-Fi project)


This time I will describe to you a simple project where access is made possible in a very unusual way with the help of a flashlight from a smartphone.


There are many different arduino door lock projects, where the access method is using a keyboard, RFID card, biometric device, WiFi, Bluetooth, etc... This time I will describe to you a project where access is made possible in a very unusual way with the help of a flashlight from a smartphone. 


Materials:

4pin Photoresistor, LDR Module

Arduino Nano

Relay SPDT, 12 Volts

RGB led diode

Power MOSFET IRF740


Circuit:

code arduino : 


#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);

  }


}

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