It is simple laser security system using LDR

Video link

lets start ----

Step 1: You Need to Make

Bread board or vero board

transistor - cl 100 or bc 548b


resistor- 1K,10K



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

Please subscribe my youtube channel technoreview85 for regular science project

visit my blog technoreview85.blogspot.com

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

About This Instructable




Bio: please visit my youtube channel Technoreview85 for more DIY project.I make new project regularly link-- https://www.youtube.com/channel/UCQeXzgRuWxVPpJjeWUB65Dw/
More by Technoreview85:Light Control Brush Robot Laser Security System  How to Make Electric Bike at Home 
Add instructable to: