This tutorial, let’s understand how to make a “Simple Laser Security System” or a “Laser Sensor” in just a few steps.
Step 1: Assembling the Electronic Components
The components you will need for making this circuit are as follows:
- LDR (Light Dependent Diode)
- L.E.D (Light Emitting Diode)
- BC547 Transistor
- 100 ohm or 330 Ohm resistor
- 9v Battery with holder
You can get all these components quickly from any electronic shop or online website.
Step 2: Circuit Diagram
It is the circuit diagram of our “Simple Laser Security System.”
Step 3: Construction of the Circuit
The BC547 Transistor has three pins. When the flat side is facing you at that time, the 1st pin is called the collector, the 2nd pin is called the base, and the 3rd pin is called the emitter.
now let’s get started;
- Set the BC547 Transistor on the breadboard.
- Then attach the LDR from the base with the emitter of the BC547 Transistor.
- Now, join one end of the 330/100-ohm resistor to the base of the BC547 Transistor. At the other end of the resistor to a clean space on the breadboard.
- Attach the anode of the L.E.D to the resistor.
- Join the cathode of the L.E.D to the collector.
- Attach the buzzer in the same way you connected the L.E.D.
- Now, connect the battery, the positive side of the battery, to the resistor. Attach the negative part of the battery to one side of the LDR.
Step 4: Testing the Simple Laser Security System
As soon as you attach the battery, the L.E.D and buzzer will come “ON” (if you’re in a darkened room). Adjust the Laser diode/light on the LDR, and you will see the L.E.D and Buzzer going “OFF” If you interrupt the laser light focusing on the LDR, the circuit will trigger, and the alarm will sound!
Congrats! Your “Simple Laser Security System” is now ready! Enjoy!