Laser Light Security System Using Arduino

Introduction:

In this project we are trying to implement a simple project using LASER with Arduino. The project idea revolves around creating a security system. Whenever any object will obstruct the LASER ray the alarm will start ringing.

Components Required:

• Arduino NANO 
• LASER
• Buzzer 
• LDR 
• Resistors (1k)
• Bread Board 
• Cable 
• Jumper wires (M-M, M-F)

Working:

The project basically works on the principle of interruption. If by any means the LASER light is interrupted the alarm will start ringing. The laser is a concentrated light source that puts out a straight beam of light of a single color. The LDR is sensitive to light and puts out a voltage when the laser light hits it. When the laser beam is interrupted and can’t reach LDR, its voltage output changes, and eventually the alarm will ring.

Circuit Diagram:

In circuit LED is used just to demonstrate, practically in place of LED we need to use

Code:

int ldrpin = A0;

int buzzpin = 13;

void setup ()

{

  Serial.begin(9600);

  pinMode (ldrpin, INPUT);

  pinMode (buzzpin, OUTPUT);

  buzz(200);

  delay(2000);

}

void loop ()

{

  int ldrval = analogRead(ldrpin);

  Serial.println(ldrval);

  if (ldrval <= 900)

  {

    buzz(500);

  }

}

void buzz(unsigned char time)

{

  digitalWrite(buzzpin, 170);

  delay (time);

  digitalWrite(buzzpin, 0);

  delay (time);

}