Published June 9, 2022

Laser based Security Alarm System

This project deals with a model of laser security alarm system design.

IntermediateFull instructions provided1 hour16,516

Things used in this project

Hardware components

Arduino UNO

Breadboard (generic)

LDR, 5 Mohm

Buzzer

LED (generic)

Male/Female Jumper Wires

Jumper wires (generic)

Laser Diode, 655 nm

USB-A to B Cable

9V battery (generic)

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Hot glue gun (generic)

Tape, Electrical

Tape, Double Sided

Story

Overview:

This project deals with a model of laser security alarm system design. Laser through long distance without any scattering effect and it is only visible at source and the destination point so it can be used as a mediator between source and destination but to analyze the source a sensor is needed, here the use of LDR is applicable. Just analysis is not enough alerting should be done in general alerting is the sound effect so here buzzer act as alerting. Making use of this, a laser security system is designed.

Understanding the problem:

With the increasing number of robberies in India, the demand for using strong security which should be fast, reliable, secure, as well as cheaper.

We have used mechanical locks long before, and now we have moved into some latest security like biometrics. But what if we want notification for any person trying to enter the premises?

This Laser-based security system will be used for implementing such a system that could detect the presence of any intruder and alert everyone by ringing the alarms and turning on all lights.

Project Objective:

The objective of the Laser-based Security alarm system is the same as its name suggests that is it will keep measuring the light coming from the Laser light using LDR, and the Arduino UNO MCU will check for the intensity to decrease from its initial value indicating obstacle between Laser light and LDR. And when the situation arises, Arduino will close the circuits for various buzzers and LEDs.

Circuit Diagram:

Circuit Diagram

Hardware Connections:

Permanent LED 1, Permanent LED 2 & Laser Light:

Terminal + to Battery Terminal +

Terminal - to Battery Terminal -

Arduino Power Supply:

Terminal + to Battery Terminal +

Terminal - to Battery Terminal -

LDR:

Terminal Vcc to Arduino Vin Port

Terminal DO to Arduino A2 Port

Terminal GND to Arduino GND Port

LED 1 & Buzzer 1:

Terminal + to Arduino GND Terminal

Terminal - to Arduino 2 Port

LED 2 & Buzzer 2:

Terminal + to Arduino GND Terminal

Terminal - to Arduino 3 Port

LED 3 & Buzzer 3:

Terminal + to Arduino GND Terminal

Terminal - to Arduino 4 Port

Arduino USB B Port to Adapter USB A Port using USB A to B cable.

Procedure:

First of all, write the code in Arduino IDE in Arduino Language.

First of all, write the code in Arduino IDE in Arduino Language.

Now upload the code to the Arduino using the USB A to B cable.

Now upload the code to the Arduino using the USB A to B cable.

Now connect the devices as mentioned in the hardware connections above and as per the circuit diagram shown.

Now connect the devices as mentioned in the hardware connections above and as per the circuit diagram shown.

Now create a structure for placing all these devices.

Now create a structure for placing all these devices.

Make sure to cover the LDR completely so that it only gets affected by the laser light, not from the outside light.

Make sure to cover the LDR completely so that it only gets affected by the laser light, not by the outside light.

After this place and angle the laser light and LDR so that the laser light falls directly on the LDR.

After this place and angle the laser light and LDR so that the laser light falls directly on the LDR.

At last turn on the power supply to start using the system.

At last turn on the power supply to start using the system.

Result:

Connections

After Turning the system on by connecting all jumper wires as mentioned in hardware connections, we will get a system like this:

After turning the system On

When Intruder is detected

Future Scope:

01Identification: We can implement a person identification system like face-recognition and fingerprint scanning features in the future.

02Various Applications: This type of system can be used in antique/expensive items protections or for various other security purposes.

03Multiple Lasers and LDRs: We can use various Lasers and LDRs to make this system more effective.

04Renewable Power Supply: We can also provide renewable energy sources like solar power to power this system.

Code

Arduino Code

int a2;
int ldr=A2;
boolean threshold=true;
void setup() {
  // put your setup code here, to run once:
  pinMode(ldr,INPUT);
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
}
void loop(){
  // put your main code here, to run repeatedly:
  while(digitalRead(ldr)==HIGH){
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
    digitalWrite(5,HIGH);
    delay(200);
    digitalWrite(2,LOW);
    digitalWrite(3,LOW);
    digitalWrite(4,LOW);
    digitalWrite(5,LOW);
    delay(100);
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
    digitalWrite(5,HIGH);
    delay(200);
    digitalWrite(2,LOW);
    digitalWrite(3,LOW);
    digitalWrite(4,LOW);
    digitalWrite(5,LOW);
    delay(500);
  }
}

Credits

Ajay Rawat

3 projects • 7 followers

Electrical Engineering student with a passion for programming. Seek knowledge. Money is just a by-product of our journey toward success.

Rohit kumar

1 project • 8 followers

I am student of Electrical Engineering College - BTKIT Dwarahat, Uttarakhand India .

Laser based Security Alarm System

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Overview:

Understanding the problem:

Project Objective:

Circuit Diagram:

Hardware Connections:

Procedure:

Result:

Future Scope:

Schematics

Schematics

Code

Arduino Code

Credits

Ajay Rawat

Rohit kumar

Comments

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Laser based Security Alarm System

Laser based Security Alarm System

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Overview:

Understanding the problem:

Project Objective:

Circuit Diagram:

Hardware Connections:

Procedure:

Result:

Future Scope:

Schematics

Schematics

Code

Arduino Code

Credits

Ajay Rawat

Rohit kumar

Comments

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