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It is simple laser security system using LDR

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lets start ----

Step 1: You Need to Make

Bread board or vero board

transistor - cl 100 or bc 548b

LDR

resistor- 1K,10K

LED

Buzzer

Battery ( I use my old mobile phone battery 3.7v)

A laser pointer

Step 2: Making Circuit

make circuit as per diagram

on bread board or vero board

Step 3: Setting Laser Pointer Alignment

for making model project you can fit circuit on a ply board or install it on door

align with LDR & laser pointer.

when laser beam can't goes to LDR then buzzer will ring & led glow

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visit my blog technoreview85.blogspot.com

<p>what is the Arduino sketch code</p>
It is not arduino project

About This Instructable

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Bio: please visit my youtube channel Technoreview85 for more DIY project.I make new project regularly link-- https://www.youtube.com/channel/UCQeXzgRuWxVPpJjeWUB65Dw/
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