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Introduction:

laser-based security alarm.
a laser-based security alarm, is a type of security system, that uses a laser light, and a light sensor, to detect any unwanted movement.
a security system protects our homes, offices, banks, lockers, etc. from intrusion and unauthorized access. there are different types of security systems available, and laser-based security system is an important and efficient type.
in this video, we will learn, how a laser security alarm is made.

these are the components, which are needed in this project.
1, NPN, transistor, BC 5 4 7.
1 kilo ohm resistor.
1 10 kilo ohm resistor.
1 red LED.
3 volt laser light.
1 LDR.
1 buzzer.
2 1.5 volt AA battery.
1 AA battery holder.
9 volt battery.
PP3 battery connector.
on off, rocker switch.
1 zero PCB.
4 screw with nuts.
and 4 plastic spacers.

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