Code for this is attached in the same repo with name "code.ino". It was run on Arduino IDE Diving into learning various sensors, I came across LDR sensor. It is basically a variable resistor which ...

An Arduino-based intruder detection system that monitors a laser beam using an LDR. When the beam is broken, an RGB LED turns red and the buzzer plays Für Elise as an alarm. The system self-calibrates ...