How To Make A Laser Light Security Alarm System

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Introduction

Safety Wellbeing is the main issue all over the Planet. Many individuals protect their homes and offices by employing a gatekeeper, however, commonly these gatekeepers additionally get hit by gatecrashers. The LASER Based Security Alarm is the circuit that gives a warning or signs ready when an interloper, or intruders attempt to attack a home, office, bank, or some other place. Along these lines, in this article, we are going to make a simple “Laser Light Security Alarm System”.

One of the key parts is LDR. Thus, before making the circuit, you simply need to comprehend the working of LDR. LDR is the electronic part where resistance gets lessened as the force of light increments. It implies that until the light falls on the LDR; the circuit doesn’t work because of its increased resistance. When there is no light, the circuit operates accordingly.

Hardware Components

The following components are required to make Laser Light Security Alarm Circuit

S.no	Component	Value	Qty
1.	Transistor	2N4403 or 2N3906	1
2.	Piezo Buzzer	–	1
3.	LDR	–	1
4.	Laser Beam (as an input source)	–	1
5.	Potentiometer	50k	1
6.	Capacitor	1000uF	1
7.	Battery	9 to 12 volts	1

2N3906 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3906

Laser Light Security Alarm Circuit

Working Explanation

In this Laser Light Security Alarm System, there is an LDR as the major electronic component. When you connect the circuit and apply the voltage, the LDR works according to the light falling or going. Thus, when there is a consistent light laser falling on the LDR, the circuit doesn’t work. At the point when somebody comes between the LASER and LDR, The LDR resistance gets decreased and current starts flowing through the circuits. As a result, the buzzer starts beeping until the circuit gets the light again on LDR.