/* Components required:
Laser module
cooling fan    //op
arduino uno 328p
5v buzzer
switch
9V Battery and its connector   //op
mirror cutting
LDR Sensor and a cap for it
usb cable
bread board
biometeric fingerprint sensor
gsm module
lcd    //op
led 4
connecting wires
*/

void setup()
{
pinMode(10,OUTPUT); //LED Pin
pinMode(7,INPUT); // LDR Sensor
}

void loop() 
{
if(digitalRead(7)==LOW ) // If LDR sensor Digital LOW then LED will turn on
{
digitalWrite(10,HIGH);
delay(3000);  
}
else {
digitalWrite(10,LOW);
}
}