Arduino Laser Security System Project

 Circuit:- 

Code:-

int Laser = 8;

int Ldr = 9;

int buzzer = 11;

void setup() 

{       

    pinMode(Laser,OUTPUT);

    pinMode(Ldr,INPUT);

    pinMode(buzzer,OUTPUT);

    

}

 void loop()

{ digitalWrite(8,HIGH);

  if(digitalRead(Ldr)==LOW)

 {

  digitalWrite(11,LOW);

 }

else

{

  digitalWrite(11,HIGH);

}

}