Objective

Create a security alarm system that sounds a buzzer anytime the laser beam is interrupted. The block diagram in Figure $1$depicts the general configuration of the security alarm system.

Circuit Description

Here$$s a basic overview of how the components are connected:

$$LDR and fixed resistor: Connected in series to form a voltage divider.

$$Relay: Connected to the output of the voltage divider circuit.

a$)$The relay$$s switch $($NC$)$links the buzzer and the red LED to the $5$volts power supply, then to ground. The buzzer and the red$-$LED are connected in parallel.

b$)$The relay$$s switch $($NO$)$links the green$-$LED to the $5$volts power supply, then to ground.

c$)$To limit the amount of current passing through the LEDs, connect an extra resistor in series.

Note: The green$-$LED indicates the normal condition while the red$-$LED is used to show an interruption of the laser $($Intrusion$).$ Components

$5$V & $12$V Relay: Acts as a switch, controlling the buzzer and indicating normal and abnormal status.

LDR $($Light Dependent Resistor$)$: Detects laser light and changes its$$resistance value$$in response to its presence or interruption.

Buzzer: Releases a sound when the relay is deactivated.

LED: Provides a visual indicator of the system's status.

Laser Pointer: Provides a focused light beam for the LDR to detect.

Power Supply: $5$V & $12$V voltage sources to power the circuit.

Resistors: To create a voltage divider with the LDR and to limit the brightness of the LEDs.

System Operation

System Armed:

When the circuit is powered on and the laser beam hits the LDR$,$the green$-$LED illuminates to show that the system is operational.

Laser Beam Undisturbed: $($Normal Status$)$

The laser beam falls on the LDR$,$keeping its resistance low and thus allowing current to pass through. The relay is armed and the NO switch closes connecting the green$-$LED to the power source.

Laser Beam Obstructed: $($Abnormal Status$)$

If something interrupts the laser beam, the LDR$\text{'}$s resistance increases, causing the relay to return to its default state and the red$-$LED with the buzzer to turn on$.$

Alarm Response:

The default status of the relay pushes the switch NC to activate the buzzer.

Simulation

Simulate the designed$$security alarm system with MultiSIM. The LDR can be replaced with a variable resistor whose value covers the range of the LDR$\text{'}$s resistance values with and without the laser beam.

Implementation

Use the above$-$mentioned components to implement on the breadboard the designed and simulated circuit. provide me with a picture of the circuit in Multisim and all its details please ASAP