SR ROBOTICS Laser Alarm Security System Working Science Model DIY KIT (Multicolor) Electronic Components Electronic Hobby Kit

he Laser Alarm Security System is a simple yet effective model used to demonstrate how lasers can be used for security and intrusion detection. It consists of a laser pointer, a photodiode or LDR (Light Dependent Resistor), a buzzer or alarm, and a power source. Working Principle: The laser beam is directed at the photodiode or LDR. As long as the beam is uninterrupted, the sensor receives light and keeps the alarm system inactive. When an intruder crosses the laser path, the beam is broken. This interruption triggers the circuit, activating the buzzer or alarm, alerting about unauthorized entry.