Introduction: Laser Security System Using Arduino UNO and LDR Module.

About: I am cadet Kartik Patil from Sainik School Bijapur. Visit my blog site i.e

This amazing project is small miniature model of how things are safeguarded in museum,banks and....etc.

-Project by

cadet Kartik Patil

Step 1: Supplies

Materials used are ;

  • Arduino UNO(it is micro-controller board based on the A T mega328p.)
  • LDR(light dependent register)this unique sensor is sensitive to light.

  • Laser

  • Beeper

  • LED (red)

  • Mirrors

  • A wooden

  • plywood

  • Jumper cables

Step 2: Procedure

Take a wooden board.Place 4 mirrors on it. These mirrors have to be placed in such a way that,the rays reflected by them would be at 90 degree.As shown above

Step 3: Schematic of the Model

Step 4: Conclusion

The concluding part is programming and here are the codes;

<p>int sensorPin =A0;<br>
int led1 = 3;
int sensorValue =0;</p><p>void setup()
  pinMode(led1,OUTPUT);</p><p>}</p><p>void loop()
  sensorValue = analogRead(sensorPin);
  Serial.println(sensorValue);</p><p>if(sensorValue > 80)
{</p><p>  digitalWrite(3,HIGH);
  delay(3000);</p><p>}</p><p>if(sensorValue <50 )
{</p><p>  digitalWrite(3,LOW);
}</p><p>In your case their may be the need to change the sensor values.
If u have done it then kindly comment me.</p><p>                                     <strong><em><u></u></em></strong></p><p>                                                                   !!All the best !!</p>