Introduction: Automatic Laser Controlled Security System

About: I'm from India and love making projects on electronics, specially with arduino. Internet is the only guidance I have and I've been into these since I was 11.

The laser controlled security system is the widely used protection for preventing the unauthorized access. It is highly efficient which works on the light based sensor and laser to protect our homes, offices, banks, locker and various important places. It detects the obstruction laser light passes across it and signals for the emergency. There are various types of security system in which laser security system is the most efficient one. It detects the signal obstruction and signals the owner in emergency. So let’s make our project and understand the principle.

Step 1: Principle:

The laser security system works in the principle of light sensor effectiveness, the LDR sensor is used in the circuit. If the light of laser is blocked by any external things to reach the sensor, then the resistance of the LDR decreases results in the high flow of current across the circuit. The construction and functioning of laser based security system is very simple and highly effective the system can also be operated on battery on large scale. It is highly secured system.

Step 2: Components Required:

1. LM358 (Op-Amp IC)

2. NE555 Timer IC (1)

3. LDR Sensor (1)

4. 10k Ohm Resistor (3)

5. 220 Ohm Resistor (1)

6. 10K Potentiometer (1)

7. BC547 NPN Transistor (1)

8. 100nF Capacitor (1)

9. Push Button. (1)

10. Small Buzzer

11. Laser Pointer (1)

12. Connecting wires (as required)

13. 9V Battery (1)

14. Bread board

Step 3: Attention Here:

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Step 4: Circuit Diagram:

Step 5: Insert 10k Ohm Resistor on the Bread Board As Shown in the Figure Below

Step 6: Connect One Terminal of the Resistor With LDR and Another Terminal to the Positive Rail of the Bread Board As Shown in Figure.

Step 7: Now Connect the Potentiometer on the Bread Board and Extend Its Terminal Through Wires

Step 8: Now Insert LM358 on the Bread Board With Connections As Per the Circuit Diagram

Step 9: Connect LM358 With Potentiometer

Step 10: Connect 220 Ohm Resistor on the Bread Board With Pin 1 of LM358

Step 11: Now Place the NPN Transistor on the Bread Board

Step 12: With Base Terminal Connected to the One End of 220 Ohm Resistor.

Step 13: Now Connect NE555 Timer IC on the Bread Board

Step 14: Connect Pin 1 and Pin 5 of the NE555 IC to the Negative Rail of the Bread Board.

Step 15: Now Place 10k Ohm Resistor on the Bread Board Through Pin 4 and Positive Rail of the Bread Board.

Step 16: Insert Buzzer on the Bread Board and Connect Its One Terminal to the Ground and Other Terminal to the Pin 3 of NE555 Timer IC As Per the Circuit Diagram.

Step 17: Connect the Momentary Push Button to Our Circuit As Shown in Figure Below

Step 18: Connect 100nF Capacitor on the Bread Board

Step 19: Now Connect the Rail Terminals of the Bread Board As Shown in the Figure Below

Step 20: 14. Connect the Power Supply With Positive Terminal to the Positive Rail of the Bread Board and Negative Terminal to the Negative Rail of the Bread Board and LED Perpendicular to the LDR As Shown.

our circuit is ready.

Step 21: When Any Object Is Get in Between and Light Falling on LDR Obstructs, the Buzzer Starts Making Sound and Alerts for an Emergency.

Step 22: And When We Push Button It Will Again Go to the Stable State and Buzzer Stops Making Sound.

So this is the basic principle and functioning of Laser Controlled Security System.

Thank You.