Introduction: Laser Security System
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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