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🎓 Trusted by Engineering Students, Makers & Innovators Across India

DIY – Lazer Alarm Electricity Kit – Tested & Verified (Educational projects and learning DIY kit)

Component	Specification
Detection Type	Optical (Light Beam Interruption)
Light Source	Red Laser Diode / High-Intensity LED
Sensor Type	LDR (Light Dependent Resistor)
Alert Type	High-Pitch Buzzer
Power Source	9V Hi-Watt Battery (Included with Connector)
Working Distance	1 - 2 Meters (Alignment Dependent)

Price

🚚 Ships within 24 Hours
📦 Pan India Delivery

₹ 152.54

(Tax included)

बारकोड: 301149

Product Description The DIY Laser Alarm Entry Alert System is a "tested and verified" security project that demonstrates the real-world application of optical sensors. By aligning a light beam with a sensitive LDR sensor, students create an invisible "tripwire." When an object or person crosses the beam, the circuit is broken, immediately triggering a loud buzzer. This kit is a favorite for science fairs and home security experiments, teaching the basics of light physics and transistor switching.

Key Features

Invisible Tripwire Logic: Replicates the technology used in professional museum and home security systems.
Precision Detection: Uses an LDR sensor that responds instantly to changes in light intensity.
Plug-and-Play Wiring: Features simplified color-coded connections (Blue to Blue, Red to Red, Black to Black) to ensure error-free assembly.
Modular Setup: The transmitter and receiver can be placed at varying distances to test the effective range of the light beam.
STEM Educational Focus: Provides a clear, hands-on demonstration of how light can be used as a digital input for electronic circuits.

Technical Details

Circuit Action: Under normal conditions, the light beam hits the LDR, keeping its resistance low and the buzzer off. When blocked, the LDR's resistance spikes, allowing the circuit to activate the alarm.
Alignment Troughs: Includes vertical stands to help maintain a steady line of sight between the light source and the sensor.
Portability: Battery-powered (9V) for use in any location without needing an AC outlet.

Prototyping and Engineering Tips from Robogears

The Alignment Challenge: The most critical step is perfect alignment. If the alarm stays on even when nothing is crossing the beam, use a small tube or "hood" around the LDR to prevent room lights from interfering with the sensor.
Range Extension: To increase the distance between the transmitter and receiver, ensure the light source is perfectly focused. You can use a small lens to concentrate the beam over longer distances.
Battery Efficiency: Always disconnect the battery snapper when the project is not in use. Even when the alarm is silent, the light source and sensor circuit continue to draw current.
Multi-Point Security: Advanced builders can use small mirrors at 45° angles to bounce the light beam around a room, creating a perimeter alarm with just one kit.

Package Includes

1 x Light Source Module (Laser/LED)
1 x LDR Sensor Module
1 x High-Pitch Buzzer
1 x Pre-Assembled Logic Board
1 x 9V Hi-Watt Battery & Snapper
1 x Set of Support Stands & Base
1 x Complete Wiring Set

Disclaimer Images are for reference; actual wire colors or PCB layout may vary. EYE SAFETY: If the kit uses a laser diode, DO NOT look directly into the beam or point it at people or animals. Adult supervision is recommended during the initial alignment phase.