Best Laser Security Alarm System using 555 IC | Innovative Science Exhibition Project

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👋 Hello friends,

In this video, I’ll show you how to make a Laser Security Alarm System using a 555 Timer IC, LDR sensor, and BC547 transistor.

This project automatically triggers an alarm when the laser beam is interrupted — perfect for home, shop, or lab security.
It’s a great electronics project for beginners, students, and anyone who loves DIY circuit building.

⏱️ Timestamps:

00:00 ▶️ Introduction
00:07 ▶️ Circuit Making Start
02:30 ▶️ Sponsor Segment
05:00 ▶️ Testing & Demonstration

🧾 Components Required:

1. 555 Timer IC

2. LDR Sensor

3. 100uF Capacitor

4. 100 Ohm Resistor

5. 100K Resistor

6. 22K Resistor

7. BC547 Transistor

8. 5V Active Buzzer

9. Push Button

10. Laser Light

11. Switch for on off the Circuit

12. 18650 Battery Holder

13. 3.7V 18650 Battery

14. Few Wires

15. MDF Board Piece for making the Base

16. Two Pieces of Wood


⚙️ How It Works:

The laser beam continuously falls on the LDR sensor.
When someone or something blocks the beam, the LDR resistance increases, changing the signal to the 555 Timer IC.
This triggers the buzzer alarm, alerting you immediately.


🧰 Tools Used:

1. Soldering Iron

2. Solder Wire

3. Wire Cutter

4. Glue Gun

5. Mini Breadboard

(You can get all tools and components easily online.)

🌐 Circuit Diagram:
📎 Available in the video or on my website → https://skrelectronicslab.com

📲 Social Media:
🔴 Instagram → @skrelectronicslab

💬 WhatsApp Store → https://wa.me/message/DCI2H32ACOLQG1

📧 For Business: skrelectronicslab@gmail.com

🙏 Thanks for watching this video ❤
Don’t forget to like 👍, share 🔁, and subscribe 🔔 for more amazing electronics projects!

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