Laser door alarm circuit (laser pointer is not include in this kit)

A Laser Door Alarm is a simple and fun school project that helps demonstrate how lasers, sensors, and basic electronics can be used to create a security system. The system that uses a laser beam as a tripwire. When someone crosses the door and blocks the laser beam, the system detects the interruption and triggers an alarm (like a buzzer or LED). This is often used to demonstrate the concept of intrusion detection.